OK, so with the help of the comments to my question and some more digging around I have found (what I think is) the correct answer:
The apache config needs to have the headers module enabled (“a2enmod headers”) and the mime module (“a2enmod mime”) and the .htaccess file needs to have sections as follows:
<IfModule mod_mime.c>
<FilesMatch "[^.]+\.css$">
Header set Content-Type: "text/css"
</FilesMatch>
<FilesMatch "[^.]+\.js$">
Header set Content-Type: "text/javascript"
</FilesMatch>
</IfModule>
Then restart apache and all errors in the browser go away.
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