Yes it does report errors - not on every page but when I move (for example) from All Posts page, which shows no errors, to a post. Any post appears to show the 4 same errors:
GET https://www.example.com/wp-admin/load-scripts.php?c=1&load[]=hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jquery-query,admin-comments,sug&load[]=gest,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,postbox,jquery-ui-position,jquery-ui-menu,wp-a11y,jquery&load[]=-ui-autocomplete,tags-suggest,tags-box,underscore,word-count,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,&load[]=media-models,wp-plupload,wp-mediaelement,wp-api-request,media-views,media-editor,media-audiovideo,mce-view,imgareaselect,image-e&load[]=dit,svg-painter,wp-auth-check,editor,wplink,media-upload,wp-embed&ver=cp_d11ce89b net::ERR_ABORTED 403
post.php:1
Refused to execute script from ‘https://www.example.comt/wp-admin/load-scripts.php?c=1&load[]=hoverIntent,common,admin-bar,heartbeat,autosave,wp-ajax-response,jquery-color,wp-lists,quicktags,jquery-query,admin-comments,sug&load[]=gest,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable,postbox,jquery-ui-position,jquery-ui-menu,wp-a11y,jquery&load[]=-ui-autocomplete,tags-suggest,tags-box,underscore,word-count,post,editor-expand,thickbox,shortcode,backbone,wp-util,wp-backbone,&load[]=media-models,wp-plupload,wp-mediaelement,wp-api-request,media-views,media-editor,media-audiovideo,mce-view,imgareaselect,image-e&load[]=dit,svg-painter,wp-auth-check,editor,wplink,media-upload,wp-embed&ver=cp_d11ce89b’ because its MIME type (‘text/html’) is not executable, and strict MIME type checking is enabled.
notice.min.js?ver=1633018414:1
Uncaught TypeError: Cannot read properties of undefined (reading ‘bindAll’)
at Object.construct (notice.min.js?ver=1633018414:1:220)
at notice.min.js?ver=1633018414:1:510
at notice.min.js?ver=1633018414:1:532
construct @ notice.min.js?ver=1633018414:1
(anonymous) @ notice.min.js?ver=1633018414:1
(anonymous) @ notice.min.js?ver=1633018414:1
add-quicktags.js?ver=2021-05-26:1
Uncaught ReferenceError: QTags is not defined
at add-quicktags.js?ver=2021-05-26:1:876
at add-quicktags.js?ver=2021-05-26:1:2060
Having read the other posts that Simone pointed me towards (many thanks!) I can confirm that I received a demand from Immunify360 to confirm that I am human, which I had never seen before but did not immediately realise that it had anything to do with my problem.
Does this need addressing by my webhosting or is it being fixed by Immunify360?