Thanks Nick for this piece of news.
Records don't seem to be digitalized, but I thought it could be a way to find the full names of RAF POWs.
Sadly the records are incomplete. It seems that a good part of the records, while having an opening date in December 2014, are still closed on the website, and you can't see the content. Example:
http://discovery.nationalarchives.go...ls/r/C14567749 (that should have the file of Sgt R L Galloway, 144 Sqn, POW on 29 September 1939)
The search engine will also find only a part of the files (the opened ones probably).