RewriteEngine on
RewriteCond %{HTTP_HOST} ^gkn\.me\.uk$ [OR]
RewriteCond %{HTTP_HOST} ^www\.gkn\.me\.uk$
RewriteCond %{REQUEST_URI} !^/[0-9]+\..+\.cpaneldcv$
RewriteCond %{REQUEST_URI} !^/\.well-known/acme-challenge/.+$
RewriteCond %{REQUEST_URI} !^/\.well-known/pki-validation/[A-F0-9]{32}\.txt(?:\ Comodo\ DCV)?$
RewriteRule ^(.*)$ "https\:\/\/gkn\.me\.uk\/$1" [R=301,L]