Use ‘q’ for default search param to match that used on nhs.uk

packages/components/header/template.njk

@@ -46,7 +46,7 @@
         <div class="nhsuk-header__search-wrap" id="wrap-search">
           <form class="nhsuk-header__search-form" id="search" action="{{ params.search.action | default('https://www.nhs.uk/search/') }}" method="get" role="search">
             <label class="nhsuk-u-visually-hidden" for="search-field">{{ params.search.visuallyHiddenLabel | default('Search the NHS website') }}</label>
-            <input class="nhsuk-search__input" id="search-field" name="{{ params.search.name | default('search-field') }}" type="search" placeholder="Search" autocomplete="off">
+            <input class="nhsuk-search__input" id="search-field" name="{{ params.search.name | default('q') }}" type="search" placeholder="Search" autocomplete="off">
             <button class="nhsuk-search__submit" type="submit">
               <svg class="nhsuk-icon nhsuk-icon__search" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false">
                 <path d="M19.71 18.29l-4.11-4.1a7 7 0 1 0-1.41 1.41l4.1 4.11a1 1 0 0 0 1.42 0 1 1 0 0 0 0-1.42zM5 10a5 5 0 1 1 5 5 5 5 0 0 1-5-5z"></path>