diff --git a/packages/components/header/README.md b/packages/components/header/README.md
index f3aff839f..7ca68c5be 100644
--- a/packages/components/header/README.md
+++ b/packages/components/header/README.md
@@ -47,10 +47,9 @@ compiled JavaScript for all components `nhsuk.min.js` or the individual componen
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link" href="https://www.nhs.uk/conditions">
               Health A-Z
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
-          <li class="nhsuk-mobile-menu-container js-show">
+          <li class="nhsuk-mobile-menu-container">
             <button class="nhsuk-header__navigation-link nhsuk-header__menu-toggle nhsuk-header__menu-toggle--visible" aria-expanded="false">
               <span class="nhsuk-u-visually-hidden">Browse</span>
               More
@@ -60,37 +59,31 @@ compiled JavaScript for all components `nhsuk.min.js` or the individual componen
               <li class="nhsuk-header__navigation-item">
                 <a class="nhsuk-header__navigation-link" href="https://www.nhs.uk/nhs-services/">
                   NHS services
-                  <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
                 </a>
               </li>
               <li class="nhsuk-header__navigation-item">
                 <a class="nhsuk-header__navigation-link" href="https://www.nhs.uk/live-well/">
                   Live Well
-                  <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
                 </a>
               </li>
               <li class="nhsuk-header__navigation-item">
                 <a class="nhsuk-header__navigation-link" href="https://www.nhs.uk/mental-health/">
                   Mental health
-                  <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
                 </a>
               </li>
               <li class="nhsuk-header__navigation-item">
                 <a class="nhsuk-header__navigation-link" href="https://www.nhs.uk/conditions/social-care-and-support/">
                   Care and support
-                  <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
                 </a>
               </li>
               <li class="nhsuk-header__navigation-item">
                 <a class="nhsuk-header__navigation-link" href="https://www.nhs.uk/pregnancy/">
                   Pregnancy
-                  <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
                 </a>
               </li>
               <li class="nhsuk-header__navigation-item nhsuk-header__navigation-item--home">
                 <a class="nhsuk-header__navigation-link" href="/">
                   Home
-                  <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
                 </a>
               </li>
             </ul>
@@ -161,43 +154,36 @@ compiled JavaScript for all components `nhsuk.min.js` or the individual componen
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="https://www.nhs.uk/conditions">
               Health A-Z
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="https://www.nhs.uk/nhs-services/">
               NHS services
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="https://www.nhs.uk/live-well/">
               Live Well
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="https://www.nhs.uk/mental-health/">
               Mental health
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="https://www.nhs.uk/conditions/social-care-and-support/">
               Care and support
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="https://www.nhs.uk/pregnancy/">
               Pregnancy
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item nhsuk-header__navigation-item--home">
             <a class="nhsuk-header__navigation-link"  href="/">
               Home
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-mobile-menu-container">
@@ -392,37 +378,31 @@ compiled JavaScript for all components `nhsuk.min.js` or the individual componen
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="#">
               Your hospital visit
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="#">
               Wards and departments
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="#">
               Conditions and treatments
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="#">
               Our people
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="#">
               Our research
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item nhsuk-header__navigation-item--home">
             <a class="nhsuk-header__navigation-link"  href="/">
               Home
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-mobile-menu-container">
@@ -515,37 +495,31 @@ compiled JavaScript for all components `nhsuk.min.js` or the individual componen
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="#">
               Your hospital visit
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="#">
               Wards and departments
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="#">
               Conditions and treatments
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="#">
               Our people
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="#">
               Our research
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item nhsuk-header__navigation-item--home">
             <a class="nhsuk-header__navigation-link"  href="/">
               Home
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-mobile-menu-container">
@@ -639,37 +613,31 @@ compiled JavaScript for all components `nhsuk.min.js` or the individual componen
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="#">
               Your hospital visit
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="#">
               Wards and departments
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="#">
               Conditions and treatments
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="#">
               Our people
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item">
             <a class="nhsuk-header__navigation-link"  href="#">
               Our research
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-header__navigation-item nhsuk-header__navigation-item--home">
             <a class="nhsuk-header__navigation-link"  href="/">
               Home
-              <svg class="nhsuk-icon nhsuk-icon__chevron-right" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" height="34" width="34"><path d="M15.5 12a1 1 0 0 1-.29.71l-5 5a1 1 0 0 1-1.42-1.42l4.3-4.29-4.3-4.29a1 1 0 0 1 1.42-1.42l5 5a1 1 0 0 1 .29.71z"></path></svg>
             </a>
           </li>
           <li class="nhsuk-mobile-menu-container">