diff --git a/code/SiteConfig.php b/code/SiteConfig.php
index 99ab4e0a2..b1886e757 100644
--- a/code/SiteConfig.php
+++ b/code/SiteConfig.php
@@ -2,12 +2,9 @@
 
 namespace SilverStripe\SiteConfig;
 
-use SilverStripe\CMS\Model\SiteTree;
 use SilverStripe\Forms\FieldList;
-use SilverStripe\Forms\FormAction;
 use SilverStripe\Forms\HiddenField;
 use SilverStripe\Forms\ListboxField;
-use SilverStripe\Forms\LiteralField;
 use SilverStripe\Forms\OptionsetField;
 use SilverStripe\Forms\Tab;
 use SilverStripe\Forms\TabSet;
@@ -21,7 +18,6 @@
 use SilverStripe\Security\PermissionProvider;
 use SilverStripe\Security\Security;
 use SilverStripe\View\TemplateGlobalProvider;
-use SilverStripe\CMS\Controllers\CMSMain;
 use SilverStripe\Forms\SearchableMultiDropdownField;
 use SilverStripe\Security\InheritedPermissions;
 
@@ -284,31 +280,6 @@ public function getCMSFields()
         return $fields;
     }
 
-    /**
-     * Get the actions that are sent to the CMS.
-     *
-     * In your extensions: updateEditFormActions($actions)
-     *
-     * @return FieldList
-     */
-    public function getCMSActions()
-    {
-        if (Permission::check('ADMIN') || Permission::check('EDIT_SITECONFIG')) {
-            $actions = FieldList::create(
-                FormAction::create(
-                    'save_siteconfig',
-                    _t('SilverStripe\\CMS\\Controllers\\CMSMain.SAVE', 'Save')
-                )->addExtraClass('btn-primary font-icon-save')
-            );
-        } else {
-            $actions = FieldList::create();
-        }
-
-        $this->extend('updateCMSActions', $actions);
-
-        return $actions;
-    }
-
     public function CMSEditLink(): ?string
     {
         return SiteConfigLeftAndMain::singleton()->Link();
@@ -317,18 +288,13 @@ public function CMSEditLink(): ?string
     /**
      * Get the current sites SiteConfig, and creates a new one through
      * {@link make_site_config()} if none is found.
-     *
-     * @return SiteConfig
      */
-    public static function current_site_config()
+    public static function current_site_config(): SiteConfig
     {
         $siteConfig = DataObject::get_one(SiteConfig::class);
         if (!$siteConfig) {
             $siteConfig = SiteConfig::make_site_config();
         }
-
-        static::singleton()->extend('updateCurrentSiteConfig', $siteConfig);
-
         return $siteConfig;
     }
 
@@ -490,6 +456,15 @@ public function canEdit($member = null)
         return Permission::checkMember($member, "EDIT_SITECONFIG");
     }
 
+    public function canDelete($member = null)
+    {
+        $extended = $this->extendedCan(__FUNCTION__, $member);
+        if ($extended !== null) {
+            return $extended;
+        }
+        return false;
+    }
+
     /**
      * @return array
      */
diff --git a/code/SiteConfigLeftAndMain.php b/code/SiteConfigLeftAndMain.php
index 84179c3a1..dea1a424e 100644
--- a/code/SiteConfigLeftAndMain.php
+++ b/code/SiteConfigLeftAndMain.php
@@ -2,179 +2,32 @@
 
 namespace SilverStripe\SiteConfig;
 
-use SilverStripe\Admin\LeftAndMain;
+use SilverStripe\Admin\SingleRecordAdmin;
 use SilverStripe\CMS\Model\SiteTree;
-use SilverStripe\Control\Director;
-use SilverStripe\Dev\Deprecation;
-use SilverStripe\Forms\Form;
-use SilverStripe\Forms\FormAction;
-use SilverStripe\Forms\HiddenField;
-use SilverStripe\Forms\LiteralField;
-use SilverStripe\Model\List\ArrayList;
-use SilverStripe\ORM\CMSPreviewable;
-use SilverStripe\ORM\DataObject;
-use SilverStripe\Core\Validation\ValidationResult;
-use SilverStripe\Versioned\RecursivePublishable;
-use SilverStripe\Model\ArrayData;
 use SilverStripe\View\Requirements;
 
-class SiteConfigLeftAndMain extends LeftAndMain
+class SiteConfigLeftAndMain extends SingleRecordAdmin
 {
-    /**
-     * @var string
-     */
-    private static $url_segment = 'settings';
+    private static string $url_segment = 'settings';
 
-    /**
-     * @var string
-     */
-    private static $url_rule = '/$Action/$ID/$OtherID';
+    private static int $menu_priority = -1;
 
-    /**
-     * @var int
-     */
-    private static $menu_priority = -1;
+    private static string $menu_title = 'Settings';
 
-    /**
-     * @var string
-     */
-    private static $menu_title = 'Settings';
+    private static string $menu_icon_class = 'font-icon-cog';
 
-    /**
-     * @var string
-     */
-    private static $menu_icon_class = 'font-icon-cog';
+    private static string $model_class = SiteConfig::class;
 
-    /**
-     * @var string
-     * @deprecated 5.4.0 Will be renamed to model_class
-     */
-    private static $tree_class = SiteConfig::class;
+    private static array $required_permission_codes = [
+        'EDIT_SITECONFIG',
+    ];
 
-    /**
-     * @var array
-     */
-    private static $required_permission_codes = array('EDIT_SITECONFIG');
-
-    /**
-     * Initialises the {@link SiteConfig} controller.
-     */
     public function init()
     {
         parent::init();
+        // Add JS required for some aspects of the access tab
         if (class_exists(SiteTree::class)) {
             Requirements::javascript('silverstripe/cms: client/dist/js/bundle.js');
         }
     }
-
-    /**
-     * @param null $id Not used.
-     * @param null $fields Not used.
-     *
-     * @return Form
-     */
-    public function getEditForm($id = null, $fields = null)
-    {
-        $siteConfig = SiteConfig::current_site_config();
-        $fields = $siteConfig->getCMSFields();
-
-        // Tell the CMS what URL the preview should show
-        $home = Director::absoluteBaseURL();
-        $fields->push(new HiddenField('PreviewURL', 'Preview URL', $home));
-
-        if ($siteConfig instanceof CMSPreviewable || $siteConfig->has_extension(CMSPreviewable::class)) {
-            // Added in-line to the form, but plucked into different view by LeftAndMain.Preview.js upon load
-            $fields->push($navField = new LiteralField(
-                'SilverStripeNavigator',
-                $this->getSilverStripeNavigator($siteConfig)
-            ));
-            $navField->setAllowHTML(true);
-        }
-
-        $validator = $siteConfig->getCMSCompositeValidator();
-
-        $actions = $siteConfig->getCMSActions();
-        $negotiator = $this->getResponseNegotiator();
-        $form = Form::create(
-            $this,
-            'EditForm',
-            $fields,
-            $actions,
-            $validator
-        )->setHTMLID('Form_EditForm');
-        $form->setValidationResponseCallback(function (ValidationResult $errors) use ($negotiator, $form) {
-            $request = $this->getRequest();
-            if ($request->isAjax() && $negotiator) {
-                $result = $form->forTemplate();
-                return $negotiator->respond($request, array(
-                    'CurrentForm' => function () use ($result) {
-                        return $result;
-                    }
-                ));
-            }
-        });
-        $form->addExtraClass('flexbox-area-grow fill-height cms-content cms-edit-form');
-        $form->setAttribute('data-pjax-fragment', 'CurrentForm');
-
-        if ($form->Fields()->hasTabSet()) {
-            $form->Fields()->findOrMakeTab('Root')->setTemplate('SilverStripe\\Forms\\CMSTabSet');
-        }
-        $form->setHTMLID('Form_EditForm');
-        $form->loadDataFrom($siteConfig);
-        $form->setTemplate($this->getTemplatesWithSuffix('_EditForm'));
-
-
-        // Announce the capability so the frontend can decide whether to allow preview or not.
-        if ($siteConfig instanceof CMSPreviewable || $siteConfig->has_extension(CMSPreviewable::class)) {
-            $form->addExtraClass('cms-previewable');
-        }
-
-        // Use <button> to allow full jQuery UI styling
-        $actions = $actions->dataFields();
-        if ($actions) {
-            /** @var FormAction $action */
-            foreach ($actions as $action) {
-                $action->setUseButtonTag(true);
-            }
-        }
-
-        $this->extend('updateEditForm', $form);
-
-        return $form;
-    }
-
-    /**
-     * Save the current sites {@link SiteConfig} into the database.
-     *
-     * @param array $data
-     * @param Form $form
-     * @return String
-     * @deprecated 5.4.0 Will be replaced with save()
-     */
-    public function save_siteconfig($data, $form)
-    {
-        Deprecation::noticeWithNoReplacment('5.4.0', 'Will be replaced with save()');
-        $data = $form->getData();
-        $siteConfig = DataObject::get_by_id(SiteConfig::class, $data['ID']);
-        $form->saveInto($siteConfig);
-        $siteConfig->write();
-        if ($siteConfig->hasExtension(RecursivePublishable::class)) {
-            $siteConfig->publishRecursive();
-        }
-        $this->response->addHeader(
-            'X-Status',
-            rawurlencode(_t('SilverStripe\\Admin\\LeftAndMain.SAVEDUP', 'Saved.'))
-        );
-        return $form->forTemplate();
-    }
-
-    public function Breadcrumbs($unlinked = false)
-    {
-        return new ArrayList(array(
-            new ArrayData(array(
-                'Title' => static::menu_title(),
-                'Link' => $this->Link()
-            ))
-        ));
-    }
 }