Why would it need to be attached to a UK licence?
I couldn't give an answer to that question which is why I asked mine. Thank you for your clarification. So, from your answer, I presume a standalone certificate is issued. What is the process on revalidation or renewal of the certificate?
attached to their FAA licence (sorry, license).
You were correct to write "licence" (singular) as above but it is 'licenses' if plural.