diff --git a/code/Controllers/CMSMain.php b/code/Controllers/CMSMain.php
index c6a003fcda..a905fe1e00 100644
--- a/code/Controllers/CMSMain.php
+++ b/code/Controllers/CMSMain.php
@@ -87,7 +87,13 @@ class CMSMain extends LeftAndMain implements CurrentPageIdentifier, PermissionPr
     /**
      * Unique ID for page icons CSS block
      */
-    const PAGE_ICONS_ID = 'PageIcons';
+    public const CMS_RECORD_ICONS_ID = 'PageIcons';
+
+    /**
+     * Unique ID for page icons CSS block
+     * @deprecated 5.4.0 use CMS_RECORD_ICONS_ID instead
+     */
+    const PAGE_ICONS_ID = CMSMain::CMS_RECORD_ICONS_ID;
 
     private static $url_segment = 'pages';
 
@@ -143,6 +149,7 @@ class CMSMain extends LeftAndMain implements CurrentPageIdentifier, PermissionPr
         'schema',
         'SearchForm',
         'SiteTreeAsUL',
+        'TreeAsUL',
         'getshowdeletedsubtree',
         'savetreenode',
         'getsubtree',
@@ -162,14 +169,17 @@ class CMSMain extends LeftAndMain implements CurrentPageIdentifier, PermissionPr
         'TreeIsFiltered' => 'Boolean',
         'AddForm' => 'HTMLFragment',
         'LinkPages' => 'Text',
+        'LinkRecords' => 'Text',
         'Link' => 'Text',
         'ListViewForm' => 'HTMLFragment',
         'ExtraTreeTools' => 'HTMLFragment',
         'PageList' => 'HTMLFragment',
         'PageListSidebar' => 'HTMLFragment',
         'SiteTreeHints' => 'HTMLFragment',
+        'TreeHints' => 'HTMLFragment',
         'SecurityID' => 'Text',
         'SiteTreeAsUL' => 'HTMLFragment',
+        'TreeAsUL' => 'HTMLFragment',
     ];
 
     private static $dependencies = [
@@ -201,7 +211,7 @@ public function index(HTTPRequest $request): HTTPResponse
         // In case we're not showing a specific record, explicitly remove any session state,
         // to avoid it being highlighted in the tree, and causing an edit form to show.
         if (!$request->param('Action')) {
-            $this->setCurrentPageID(null);
+            $this->setCurrentRecordID(null);
         }
 
         return parent::index($request);
@@ -223,9 +233,11 @@ public function getResponseNegotiator(): PjaxResponseNegotiator
      * Get pages listing area
      *
      * @return DBHTMLText
+     * @deprecated 5.4.0 Will be renamed to RecordList
      */
     public function PageList()
     {
+        Deprecation::noticeWithNoReplacment('5.4.0', 'Will be renamed to RecordList');
         return $this->renderWith($this->getTemplatesWithSuffix('_PageList'));
     }
 
@@ -233,9 +245,11 @@ public function PageList()
      * Page list view for edit-form
      *
      * @return DBHTMLText
+     * @deprecated 5.4.0 Will be removed without equivalent functionality
      */
     public function PageListSidebar()
     {
+        Deprecation::noticeWithNoReplacment('5.4.0');
         return $this->renderWith($this->getTemplatesWithSuffix('_PageList_Sidebar'));
     }
 
@@ -260,7 +274,7 @@ public function ShowSwitchView()
     public function SwitchView($page = null)
     {
         if (!$page) {
-            $page = $this->currentPage();
+            $page = $this->currentRecord();
         }
 
         if ($page) {
@@ -293,14 +307,32 @@ public function Link($action = null)
         return $link;
     }
 
+    /**
+     * @deprecated 5.4.0 Use LinkRecords instead
+     */
     public function LinkPages()
+    {
+        Deprecation::notice('5.4.0', 'Use LinkRecords() instead.');
+        return $this->LinkRecords();
+    }
+
+    public function LinkRecords()
     {
         return CMSPagesController::singleton()->Link();
     }
 
+    /**
+     * @deprecated 5.4.0 Use LinkRecordsWithSearch instead
+     */
     public function LinkPagesWithSearch()
     {
-        return $this->LinkWithSearch($this->LinkPages());
+        Deprecation::notice('5.4.0', 'Use LinkRecordsWithSearch() instead.');
+        return $this->LinkRecordsWithSearch();
+    }
+
+    public function LinkRecordsWithSearch()
+    {
+        return $this->LinkWithSearch($this->LinkRecords());
     }
 
     /**
@@ -379,19 +411,37 @@ public function getCMSEditLinkForManagedDataObject(SiteTree $obj): string
         return Controller::join_links(CMSPageEditController::singleton()->Link('show'), $obj->ID);
     }
 
+    /**
+     * @deprecated 5.4.0 Use LinkRecordEdit() instead.
+     */
     public function LinkPageEdit($id = null)
+    {
+        Deprecation::notice('5.4.0', 'Use LinkRecordEdit() instead.');
+        return $this->LinkRecordEdit($id);
+    }
+
+    public function LinkRecordEdit($id = null)
     {
         if (!$id) {
-            $id = $this->currentPageID();
+            $id = $this->currentRecordID();
         }
         return $this->LinkWithSearch(
             Controller::join_links(CMSPageEditController::singleton()->Link('show'), $id)
         );
     }
 
+    /**
+     * @deprecated 5.4.0 Use LinkRecordSettings() instead.
+     */
     public function LinkPageSettings()
     {
-        if ($id = $this->currentPageID()) {
+        Deprecation::notice('5.4.0', 'Use LinkRecordSettings() instead.');
+        return $this->LinkRecordSettings();
+    }
+
+    public function LinkRecordSettings()
+    {
+        if ($id = $this->currentRecordID()) {
             return $this->LinkWithSearch(
                 Controller::join_links(CMSPageSettingsController::singleton()->Link('show'), $id)
             );
@@ -400,10 +450,19 @@ public function LinkPageSettings()
         }
     }
 
+    /**
+     * @deprecated 5.4.0 Use LinkRecordHistory() instead.
+     */
     public function LinkPageHistory()
+    {
+        Deprecation::notice('5.4.0', 'Use LinkRecordHistory() instead.');
+        return $this->LinkRecordHistory();
+    }
+
+    public function LinkRecordHistory()
     {
         $controller = Injector::inst()->get(CMSPageHistoryViewerController::class);
-        if (($id = $this->currentPageID()) && $controller) {
+        if (($id = $this->currentRecordID()) && $controller) {
             if ($controller) {
                 return $this->LinkWithSearch(
                     Controller::join_links($controller->Link('show'), $id)
@@ -467,7 +526,16 @@ public function LinkWithSearch($link)
         return $link;
     }
 
+    /**
+     * @deprecated 5.4.0 Use LinkRecordAdd() instead.
+     */
     public function LinkPageAdd($extra = null, $placeholders = null)
+    {
+        Deprecation::notice('5.4.0', 'Use LinkRecordAdd() instead.');
+        return $this->LinkRecordAdd($extra, $placeholders);
+    }
+
+    public function LinkRecordAdd($extra = null, $placeholders = null)
     {
         $link = CMSPageAddController::singleton()->Link();
         $this->extend('updateLinkPageAdd', $link);
@@ -485,10 +553,12 @@ public function LinkPageAdd($extra = null, $placeholders = null)
 
     /**
      * @return string
+     * @deprecated 5.4.0 Use SilverStripe\CMS\Model\SiteTree::CMSEditLink() instead.
      */
     public function LinkPreview()
     {
-        $record = $this->getRecord($this->currentPageID());
+        Deprecation::notice('5.4.0', 'Use ' . SiteTree::class . '::CMSEditLink() instead.');
+        $record = $this->getRecord($this->currentRecordID());
         $baseLink = Director::absoluteBaseURL();
         if ($record && $record instanceof SiteTree) {
             // if we are an external redirector don't show a link
@@ -503,8 +573,18 @@ public function LinkPreview()
 
     /**
      * Return the entire site tree as a nested set of ULs
+     * @deprecated 5.4.0 Use TreeAsUL() instead.
      */
     public function SiteTreeAsUL()
+    {
+        Deprecation::notice('5.4.0', 'Use TreeAsUL() instead.');
+        return $this->TreeAsUL();
+    }
+
+    /**
+     * Return the entire tree as a nested set of ULs
+     */
+    public function TreeAsUL()
     {
         $treeClass = $this->config()->get('tree_class');
         $filter = $this->getSearchFilter();
@@ -514,7 +594,7 @@ public function SiteTreeAsUL()
             'numChildrenMethod' => $filter ? $filter->getNumChildrenMethod() : 'numChildren',
         ]);
 
-        $html = $this->getSiteTreeFor($treeClass);
+        $html = $this->getTreeFor($treeClass);
 
         $this->extend('updateSiteTreeAsUL', $html);
 
@@ -533,6 +613,7 @@ public function SiteTreeAsUL()
      * @param callable $filterFunction
      * @param int $nodeCountThreshold
      * @return string Nested unordered list with links to each page
+     * @deprecated 5.4.0 Use getTreeFor() instead.
      */
     public function getSiteTreeFor(
         $className,
@@ -541,6 +622,38 @@ public function getSiteTreeFor(
         $numChildrenMethod = null,
         $filterFunction = null,
         $nodeCountThreshold = null
+    ) {
+        Deprecation::notice('5.4.0', 'Use getTreeFor() instead.');
+        return $this->getTreeFor(
+            $className,
+            $rootID,
+            $childrenMethod,
+            $numChildrenMethod,
+            $filterFunction,
+            $nodeCountThreshold
+        );
+    }
+
+    /**
+     * Get a tree HTML listing which displays the nodes under the given criteria.
+     *
+     * @param string $className The class of the root object
+     * @param string $rootID The ID of the root object.  If this is null then a complete tree will be
+     *  shown
+     * @param string $childrenMethod The method to call to get the children of the tree. For example,
+     *  Children, AllChildrenIncludingDeleted, or AllHistoricalChildren
+     * @param string $numChildrenMethod
+     * @param callable $filterFunction
+     * @param int $nodeCountThreshold
+     * @return string Nested unordered list with links to each record
+     */
+    public function getTreeFor(
+        $className,
+        $rootID = null,
+        $childrenMethod = null,
+        $numChildrenMethod = null,
+        $filterFunction = null,
+        $nodeCountThreshold = null
     ) {
         $nodeCountThreshold = is_null($nodeCountThreshold) ? Config::inst()->get($className, 'node_threshold_total') : $nodeCountThreshold;
         // Provide better defaults from filter
@@ -573,7 +686,7 @@ public function getSiteTreeFor(
         $markingSet->markPartialTree();
 
         // Ensure current page is exposed
-        $currentPage = $this->currentPage();
+        $currentPage = $this->currentRecord();
         if ($currentPage) {
             $markingSet->markToExpose($currentPage);
         }
@@ -658,7 +771,7 @@ public function getTreeNodeClasses(SiteTree $node)
      */
     public function getsubtree(HTTPRequest $request): HTTPResponse
     {
-        $html = $this->getSiteTreeFor(
+        $html = $this->getTreeFor(
             $this->config()->get('tree_class'),
             $request->getVar('ID'),
             null,
@@ -754,7 +867,7 @@ public function savetreenode(HTTPRequest $request): HTTPResponse
         if (!SecurityToken::inst()->checkRequest($request)) {
             $this->httpError(400);
         }
-        if (!$this->CanOrganiseSitetree()) {
+        if (!$this->canOrganiseTree()) {
             $this->httpError(
                 403,
                 _t(
@@ -863,12 +976,21 @@ public function savetreenode(HTTPRequest $request): HTTPResponse
     /**
      * Whether the current member has the permission to reorganise SiteTree objects.
      * @return bool
+     * @deprecated 5.4.0 Use canOrganiseTree instead.
      */
     public function CanOrganiseSitetree()
     {
-        return Permission::check('SITETREE_REORGANISE');
+        Deprecation::notice('5.4.0', 'Use canOrganiseTree instead.');
+        return $this->canOrganiseTree();
     }
 
+    /**
+     * Whether the current member has the permission to reorganise SiteTree objects.
+     */
+    public function canOrganiseTree(): bool
+    {
+        return Permission::check('SITETREE_REORGANISE');
+    }
 
     /**
      * @return boolean
@@ -891,9 +1013,11 @@ public function ExtraTreeTools()
      * and can be modified on extensions through updateSearchContext
      *
      * @return \SilverStripe\ORM\Search\SearchContext
+     * @deprecated 5.4.0 Will be replaced with SilverStripe\CMS\Model\SiteTree::getDefaultSearchContext().
      */
     public function getSearchContext()
     {
+        Deprecation::notice('5.4.0', 'Will be replaced with ' . SiteTree::class . '::getDefaultSearchContext().');
         $context = SiteTree::singleton()->getDefaultSearchContext();
 
         $this->extend('updateSearchContext', $context);
@@ -963,7 +1087,7 @@ public function getSearchForm()
         $pageClasses = DropdownField::create(
             'Search__ClassName',
             _t('SilverStripe\\CMS\\Controllers\\CMSMain.PAGETYPEOPT', 'Page type', 'Dropdown for limiting search to a page type'),
-            $this->getPageTypes()
+            $this->getRecordTypes()
         );
         $pageClasses->setEmptyString(_t('SilverStripe\\CMS\\Controllers\\CMSMain.PAGETYPEANYOPT', 'Any'));
 
@@ -1007,15 +1131,25 @@ public function getSearchForm()
      * Returns a sorted array suitable for a dropdown with pagetypes and their translated name
      *
      * @return array
+     * @deprecated 5.4.0 Use getRecordTypes() instead.
      */
     protected function getPageTypes()
     {
-        $pageTypes = [];
-        foreach (SiteTree::page_type_classes() as $pageTypeClass) {
-            $pageTypes[$pageTypeClass] = SiteTree::singleton($pageTypeClass)->i18n_singular_name();
+        Deprecation::notice('5.4.0', 'Use getRecordTypes() instead.');
+        return $this->getRecordTypes();
+    }
+
+    /**
+     * Returns a sorted array suitable for a dropdown with record types and their translated name
+     */
+    protected function getRecordTypes(): array
+    {
+        $types = [];
+        foreach (SiteTree::page_type_classes() as $class) {
+            $types[$class] = SiteTree::singleton($class)->i18n_singular_name();
         }
-        asort($pageTypes);
-        return $pageTypes;
+        asort($types);
+        return $types;
     }
 
     public function doSearch(array $data, Form $form): HTTPResponse
@@ -1044,7 +1178,7 @@ public function Breadcrumbs($unlinked = false)
     {
         $items = ArrayList::create();
 
-        if (($this->getAction() !== 'index') && ($record = $this->currentPage())) {
+        if (($this->getAction() !== 'index') && ($record = $this->currentRecord())) {
             // The page is being edited
             $this->buildEditFormBreadcrumb($items, $record, $unlinked);
         } else {
@@ -1136,8 +1270,21 @@ private function buildListViewBreadcrumb(ArrayList $items, SiteTree $page): void
      * 'data-hints' attribute of root node of jsTree.
      *
      * @return string Serialized JSON
+     * @deprecated 5.4.0 Use TreeHints() instead.
      */
     public function SiteTreeHints()
+    {
+        Deprecation::notice('5.4.0', 'Use TreeHints() instead.');
+        return $this->TreeHints();
+    }
+
+    /**
+     * Create serialized JSON string with site tree hints data to be injected into
+     * 'data-hints' attribute of root node of jsTree.
+     *
+     * @return string Serialized JSON
+     */
+    public function TreeHints(): string
     {
         $classes = SiteTree::page_type_classes();
         $memberID = Security::getCurrentUser() ? Security::getCurrentUser()->ID : 0;
@@ -1209,8 +1356,19 @@ public function SiteTreeHints()
      * which allows the user to change the page type.
      *
      * @return SS_List
+     * @deprecated 5.4.0 use RecordTypes() instead.
      */
     public function PageTypes()
+    {
+        Deprecation::notice('5.4.0', 'Use RecordTypes() instead.');
+        return $this->RecordTypes();
+    }
+
+    /**
+     * Populates an array of classes in the CMS
+     * which allows the user to change the record's ClassName field.
+     */
+    public function RecordTypes(): SS_List
     {
         $classes = SiteTree::page_type_classes();
 
@@ -1314,7 +1472,7 @@ public function EditForm($request = null)
                 $this->httpError(400);
                 return null;
             }
-            $this->setCurrentPageID($id);
+            $this->setCurrentRecordID($id);
         }
         return $this->getEditForm();
     }
@@ -1328,7 +1486,7 @@ public function getEditForm($id = null, $fields = null)
     {
         // Get record
         if (!$id) {
-            $id = $this->currentPageID();
+            $id = $this->currentRecordID();
         }
         $record = $this->getRecord($id);
 
@@ -1574,7 +1732,7 @@ public function ViewState($default = 'treeview')
 
     /**
      * Callback to request the list of page types allowed under a given page instance.
-     * Provides a slower but more precise response over SiteTreeHints
+     * Provides a slower but more precise response over TreeHints
      */
     public function childfilter(HTTPRequest $request): HTTPResponse
     {
@@ -1671,7 +1829,7 @@ public function ListViewForm()
                     ->setLinkSpec($linkSpec)
                     ->setAttributes(['data-pjax-target' => 'ListViewForm,Breadcrumbs'])
             );
-            $this->setCurrentPageID($parentID);
+            $this->setCurrentRecordID($parentID);
         }
         $gridField = GridField::create('Page', 'Pages', $list, $gridFieldConfig);
         $gridField->setAttribute('cms-loading-ignore-url-params', true);
@@ -1761,6 +1919,13 @@ public function currentPageID()
         return $id;
     }
 
+    public function currentRecordID(): ?int
+    {
+        $id = parent::currentRecordID();
+        $this->extend('updateCurrentPageID', $id);
+        return $id;
+    }
+
     //------------------------------------------------------------------------------------------//
     // Data saving handlers
 
@@ -1894,6 +2059,7 @@ public function getNewItem($id, $setID = true)
      *
      * @param Versioned|DataObject $record
      * @return mixed
+     * @deprecated 5.4.0 Use SilverStripe\Versioned\RecursivePublishable::publishRecursive() instead.
      */
     public function performPublish($record)
     {
@@ -2062,7 +2228,7 @@ public function unpublish(array $data, Form $form): HTTPResponse
     public function rollback()
     {
         return $this->doRollback([
-            'ID' => $this->currentPageID(),
+            'ID' => $this->currentRecordID(),
             'Version' => $this->getRequest()->param('VersionID')
         ], null);
     }
@@ -2300,7 +2466,7 @@ protected function getCMSTreeTitle()
     }
 
     /**
-     * Cache key for SiteTreeHints() method
+     * Cache key for TreeHints() method
      *
      * @param $memberID
      * @return string
diff --git a/code/Controllers/CMSPageAddController.php b/code/Controllers/CMSPageAddController.php
index 87a236e85e..8de0237b6c 100644
--- a/code/Controllers/CMSPageAddController.php
+++ b/code/Controllers/CMSPageAddController.php
@@ -8,6 +8,7 @@
 use SilverStripe\Control\HTTPResponse;
 use SilverStripe\Core\Config\Config;
 use SilverStripe\Core\Convert;
+use SilverStripe\Dev\Deprecation;
 use SilverStripe\Forms\FieldList;
 use SilverStripe\Forms\Form;
 use SilverStripe\Forms\FormAction;
@@ -23,6 +24,9 @@
 use SilverStripe\Security\Security;
 use SilverStripe\SiteConfig\SiteConfig;
 
+/**
+ * @deprecated 5.4.0 Will be replaced with SilverStripe\CMS\Forms\CMSMainAddForm
+ */
 class CMSPageAddController extends CMSPageEditController
 {
 
@@ -38,6 +42,16 @@ class CMSPageAddController extends CMSPageEditController
         'doCancel'
     ];
 
+    public function __construct()
+    {
+        Deprecation::noticeWithNoReplacment(
+            '5.4.0',
+            'Will be replaced with SilverStripe\CMS\Forms\CMSMainAddForm',
+            Deprecation::SCOPE_CLASS
+        );
+        parent::__construct();
+    }
+
     /**
      * @return Form
      */
@@ -134,7 +148,7 @@ public function AddForm()
 
         $parentModeField->addExtraClass('parent-mode');
 
-        // CMSMain->currentPageID() automatically sets the homepage,
+        // CMSMain->currentRecordID() automatically sets the homepage,
         // which we need to counteract in the default selection (which should default to root, ID=0)
         if ($parentID = $this->getRequest()->getVar('ParentID')) {
             $parentModeField->setValue('child');
@@ -220,7 +234,7 @@ public function doAdd(array $data, Form $form): HTTPResponse
 
         $editController = CMSPageEditController::singleton();
         $editController->setRequest($this->getRequest());
-        $editController->setCurrentPageID($record->ID);
+        $editController->setCurrentRecordID($record->ID);
 
         $session = $this->getRequest()->getSession();
         $session->set(
diff --git a/code/Controllers/CMSPageSettingsController.php b/code/Controllers/CMSPageSettingsController.php
index 1450a33387..340131b6ef 100644
--- a/code/Controllers/CMSPageSettingsController.php
+++ b/code/Controllers/CMSPageSettingsController.php
@@ -17,7 +17,7 @@ class CMSPageSettingsController extends CMSMain
 
     public function getEditForm($id = null, $fields = null)
     {
-        $record = $this->getRecord($id ?: $this->currentPageID());
+        $record = $this->getRecord($id ?: $this->currentRecordID());
 
         return parent::getEditForm($id, ($record) ? $record->getSettingsFields() : null);
     }
diff --git a/code/Controllers/CMSPagesController.php b/code/Controllers/CMSPagesController.php
index 9d30509da6..bc73327969 100644
--- a/code/Controllers/CMSPagesController.php
+++ b/code/Controllers/CMSPagesController.php
@@ -4,11 +4,15 @@
 
 use SilverStripe\CMS\Model\SiteTree;
 use SilverStripe\Control\Controller;
+use SilverStripe\Dev\Deprecation;
 use SilverStripe\ORM\ArrayList;
 use SilverStripe\ORM\DataObject;
 use SilverStripe\View\ArrayData;
 use stdClass;
 
+/**
+ * @deprecated 5.4.0 Will be combined back into SilverStripe\CMS\Controllers\CMSMain
+ */
 class CMSPagesController extends CMSMain
 {
 
@@ -22,6 +26,16 @@ class CMSPagesController extends CMSMain
 
     private static $required_permission_codes = 'CMS_ACCESS_CMSMain';
 
+    public function __construct()
+    {
+        Deprecation::noticeWithNoReplacment(
+            '5.4.0',
+            'Will be combined back into ' . CMSMain::class,
+            Deprecation::SCOPE_CLASS
+        );
+        parent::__construct();
+    }
+
     public function LinkPreview()
     {
         return false;
diff --git a/code/Controllers/CMSSiteTreeFilter.php b/code/Controllers/CMSSiteTreeFilter.php
index d73fe96456..8124967ce8 100644
--- a/code/Controllers/CMSSiteTreeFilter.php
+++ b/code/Controllers/CMSSiteTreeFilter.php
@@ -7,6 +7,7 @@
 use SilverStripe\Core\ClassInfo;
 use SilverStripe\Core\Convert;
 use SilverStripe\Core\Injector\Injectable;
+use SilverStripe\Dev\Deprecation;
 use SilverStripe\Forms\DateField;
 use SilverStripe\ORM\DataList;
 use SilverStripe\ORM\SS_List;
@@ -113,8 +114,12 @@ public function getNumChildrenMethod()
         return $this->numChildrenMethod;
     }
 
+    /**
+     * @deprecated 5.4.0 Will be renamed to getRecordClasses()
+     */
     public function getPageClasses($page)
     {
+        Deprecation::noticeWithNoReplacment('5.4.0', 'Will be renamed to getRecordClasses()');
         if ($this->_cache_ids === null) {
             $this->populateIDs();
         }
@@ -178,8 +183,12 @@ protected function populateIDs()
         }
     }
 
+    /**
+     * @deprecated 5.4.0 Will be renamed to isRecordIncluded()
+     */
     public function isPageIncluded($page)
     {
+        Deprecation::noticeWithNoReplacment('5.4.0', 'Will be renamed to isRecordIncluded()');
         if ($this->_cache_ids === null) {
             $this->populateIDs();
         }
diff --git a/code/Controllers/LeftAndMainPageIconsExtension.php b/code/Controllers/LeftAndMainPageIconsExtension.php
index e962322f06..7b639cf936 100644
--- a/code/Controllers/LeftAndMainPageIconsExtension.php
+++ b/code/Controllers/LeftAndMainPageIconsExtension.php
@@ -13,22 +13,34 @@
 use SilverStripe\Core\Extension;
 use SilverStripe\Core\Flushable;
 use SilverStripe\Core\Injector\Injector;
+use SilverStripe\Dev\Deprecation;
 use SilverStripe\View\Requirements;
 
 /**
  * Extension to include custom page icons
  *
  * @extends Extension<LeftAndMain>
+ * @deprecated 5.4.0 Will be renamed to SilverStripe\CMS\Controllers\LeftAndMainRecordIconsExtension
  */
 class LeftAndMainPageIconsExtension extends Extension implements Flushable
 {
+    public function __construct()
+    {
+        Deprecation::noticeWithNoReplacment(
+            '5.4.0',
+            'Will be renamed to SilverStripe\CMS\Controllers\LeftAndMainRecordIconsExtension',
+            Deprecation::SCOPE_CLASS
+        );
+        parent::__construct();
+    }
+
     /**
      * @throws InvalidArgumentException
      * @throws ReflectionException
      */
     public function init()
     {
-        Requirements::customCSS($this->generatePageIconsCss(), CMSMain::PAGE_ICONS_ID);
+        Requirements::customCSS($this->generateRecordIconsCss(), CMSMain::CMS_RECORD_ICONS_ID);
     }
 
     /**
@@ -39,7 +51,6 @@ public static function flush()
         Injector::inst()->get(CacheInterface::class . '.SiteTree_PageIcons')->clear();
     }
 
-
     /**
      * Include CSS for page icons. We're not using the JSTree 'types' option
      * because it causes too much performance overhead just to add some icons.
@@ -47,8 +58,22 @@ public static function flush()
      * @return string CSS
      * @throws InvalidArgumentException
      * @throws ReflectionException
+     * @deprecated 5.4.0 Use generateRecordIconsCss() instead.
      */
     public function generatePageIconsCss()
+    {
+        Deprecation::notice('5.4.0', 'Use generateRecordIconsCss() instead.');
+        return $this->generateRecordIconsCss();
+    }
+
+    /**
+     * Include CSS for page icons. We're not using the JSTree 'types' option
+     * because it causes too much performance overhead just to add some icons.
+     *
+     * @throws InvalidArgumentException
+     * @throws ReflectionException
+     */
+    public function generateRecordIconsCss(): string
     {
         /** @var CacheInterface $cache */
         $cache = Injector::inst()->get(CacheInterface::class . '.SiteTree_PageIcons');
diff --git a/code/Model/CurrentPageIdentifier.php b/code/Model/CurrentPageIdentifier.php
index bee76b8239..0228554577 100644
--- a/code/Model/CurrentPageIdentifier.php
+++ b/code/Model/CurrentPageIdentifier.php
@@ -6,6 +6,7 @@
 
 /**
  * This interface lets us set up objects that will tell us what the current page is.
+ * @deprecated 5.4.0 Will be renamed to SilverStripe\CMS\Model\CurrentRecordIdentifier
  */
 interface CurrentPageIdentifier
 {
@@ -13,6 +14,7 @@ interface CurrentPageIdentifier
     /**
      * Get the current page ID.
      * @return int
+     * @deprecated 5.4.0 Will be renamed to currentRecordID()
      */
     public function currentPageID();
 
@@ -20,6 +22,7 @@ public function currentPageID();
      * Check if the given DataObject is the current page.
      * @param DataObject $page The page to check.
      * @return boolean
+     * @deprecated 5.4.0 Will be renamed to isCurrentRecord()
      */
     public function isCurrentPage(DataObject $page);
 }
diff --git a/code/Model/RedirectorPage.php b/code/Model/RedirectorPage.php
index a79a11bdb2..aa0145b4a1 100644
--- a/code/Model/RedirectorPage.php
+++ b/code/Model/RedirectorPage.php
@@ -30,6 +30,9 @@ class RedirectorPage extends Page
 
     private static string $class_description = 'Redirects requests to another location';
 
+    /**
+     * @deprecated 5.4.0 Will be renamed to cms_icon_class
+     */
     private static $icon_class = 'font-icon-p-redirect';
 
     private static $show_stage_link = false;
diff --git a/code/Model/SiteTree.php b/code/Model/SiteTree.php
index c2a109ae41..b96a161ea3 100755
--- a/code/Model/SiteTree.php
+++ b/code/Model/SiteTree.php
@@ -194,6 +194,7 @@ class SiteTree extends DataObject implements PermissionProvider, i18nEntityProvi
      *
      * @config
      * @var array
+     * @deprecated 5.4.0 Use canCreate() instead.
      */
     private static $need_permission = null;
 
@@ -327,6 +328,7 @@ class SiteTree extends DataObject implements PermissionProvider, i18nEntityProvi
      * @see LeftAndMainPageIconsExtension::generatePageIconsCss()
      * @config
      * @var string
+     * @deprecated 5.4.0 Will be renamed to cms_icon
      */
     private static $icon = null;
 
@@ -334,6 +336,7 @@ class SiteTree extends DataObject implements PermissionProvider, i18nEntityProvi
      * Class attached to page icons in the CMS page tree. Also supports font-icon set.
      * @config
      * @var string
+     * @deprecated 5.4.0 Will be renamed to cms_icon_class
      */
     private static $icon_class = 'font-icon-page';
 
@@ -565,6 +568,7 @@ public static function get_by_link($link, $cache = true)
      * Return a subclass map of SiteTree that shouldn't be hidden through {@link SiteTree::$hide_pagetypes}
      *
      * @return array
+     * @deprecated 5.4.0 Will be replaced with updateAllowedSubClasses()
      */
     public static function page_type_classes()
     {
@@ -1022,9 +1026,14 @@ public function getParent()
     /**
      * @param CacheInterface $cache
      * @return $this
+     * @deprecated 5.4.0 Will be replaced with SilverStripe\CMS\Controllers\CMSMain::setCreatableChildrenCache()
      */
     public function setCreatableChildrenCache(CacheInterface $cache)
     {
+        Deprecation::noticeWithNoReplacment(
+            '5.4.0',
+            'Will be replaced with ' . CMSMain::class . '::setCreatableChildrenCache()'
+        );
         $this->creatableChildrenCache = $cache;
 
         return $this;
@@ -1032,9 +1041,14 @@ public function setCreatableChildrenCache(CacheInterface $cache)
 
     /**
      * @return CacheInterface $cache
+     * @deprecated 5.4.0 Will be replaced with SilverStripe\CMS\Controllers\CMSMain::getCreatableChildrenCache()
      */
     public function getCreatableChildrenCache()
     {
+        Deprecation::noticeWithNoReplacment(
+            '5.4.0',
+            'Will be replaced with ' . CMSMain::class . '::getCreatableChildrenCache()'
+        );
         return $this->creatableChildrenCache;
     }
 
@@ -1399,9 +1413,11 @@ public function getSiteConfig()
 
     /**
      * @return PermissionChecker
+     * @deprecated 5.4.0 Will be replaced with a non-static method with the same name.
      */
     public static function getPermissionChecker()
     {
+        Deprecation::noticeWithNoReplacment('5.4.0', 'Will be replaced with a non-static method with the same name.');
         return Injector::inst()->get(PermissionChecker::class.'.sitetree');
     }
 
@@ -1801,9 +1817,14 @@ public function flushCache($persistent = true)
      * Flushes the member specific cache for creatable children
      *
      * @param array $memberIDs
+     * @deprecated 5.4.0 Will be replaced with SilverStripe\CMS\Controllers\CMSMain::clearCache()
      */
     public function flushMemberCache($memberIDs = null)
     {
+        Deprecation::noticeWithNoReplacment(
+            '5.4.0',
+            'Will be replaced with ' . CMSMain::class . '::clearCache()'
+        );
         $cache = SiteTree::singleton()->getCreatableChildrenCache();
 
         if (!$memberIDs) {
@@ -2844,9 +2865,14 @@ public function allowedChildren()
      * Gets a list of the page types that can be created under this specific page, including font icons
      *
      * @return array
+     * @deprecated 5.4.0 Will be replaced with SilverStripe\CMS\Controllers\CMSMain::getCreatableSubClasses()
      */
     public function creatableChildPages()
     {
+        Deprecation::noticeWithNoReplacment(
+            '5.4.0',
+            'Will be replaced with ' . CMSMain::class . '::getCreatableSubClasses()'
+        );
         // Build the list of candidate children
         $cache = SiteTree::singleton()->getCreatableChildrenCache();
         $cacheKey = $this->generateChildrenCacheKey(Security::getCurrentUser() ? Security::getCurrentUser()->ID : 0);
@@ -2985,9 +3011,14 @@ public function getStatusFlags($cached = true)
      * Returns the CSS class used for the page icon in the site tree.
      *
      * @return string
+     * @deprecated 5.4.0 Will be replaced with SilverStripe\CMS\Controllers\CMSMain::getRecordIconCssClass()
      */
     public function getIconClass()
     {
+        Deprecation::noticeWithNoReplacment(
+            '5.4.0',
+            'Will be replaced with ' . CMSMain::class . '::getRecordIconCssClass()'
+        );
         if ($this->config()->get('icon')) {
             return '';
         }
@@ -3223,9 +3254,14 @@ public function plural_name()
      * Generate link to this page's icon
      *
      * @return string
+     * @deprecated 5.4.0 Will be replaced with SilverStripe\CMS\Controllers\CMSMain::getRecordIconUrl()
      */
     public function getPageIconURL()
     {
+        Deprecation::noticeWithNoReplacment(
+            '5.4.0',
+            'Will be replaced with ' . CMSMain::class . '::getRecordIconUrl()'
+        );
         $icon = $this->config()->get('icon');
         if (!$icon) {
             return null;
@@ -3352,9 +3388,14 @@ protected function updateDependentPages()
      *
      * @param int $memberID
      * @return string
+     * @deprecated 5.4.0 Will be replaced with SilverStripe\CMS\Controllers\CMSMain::generateChildrenCacheKey()
      */
     protected function generateChildrenCacheKey($memberID)
     {
+        Deprecation::noticeWithNoReplacment(
+            '5.4.0',
+            'Will be replaced with ' . CMSMain::class . '::generateChildrenCacheKey()'
+        );
         return md5($memberID . '_' . __CLASS__);
     }
 
diff --git a/code/Model/VirtualPage.php b/code/Model/VirtualPage.php
index 1d158bf05c..024a83ca51 100644
--- a/code/Model/VirtualPage.php
+++ b/code/Model/VirtualPage.php
@@ -33,6 +33,9 @@ class VirtualPage extends Page
 
     private static string $class_description = 'Displays the content of another page';
 
+    /**
+     * @deprecated 5.4.0 Will be renamed to cms_icon_class
+     */
     private static $icon_class = 'font-icon-p-virtual';
 
     public static $virtualFields;