Thanks for your reply.
Just to clarify - although as EU citizen I could obtain naturalisation using my valid national identity card and not passport (I have submitted both though), for the purpose of the British passport application, I need to have a valid current EU passport?

Hi all, I'm trying to find more information about the documents that need to be submitted when applying for the first British passport after naturalisation process. I found on the official website that one needs to submit naturalisation certificate along with "the passport you used to come into the ...