Thanks all for your replies.
I don't have access to an RAF list. I've just spent some time tracking my father down via the Gazette and it's a bit too time consuming for my needs.
As for blind-siding him with bold face drills or "having a quiet word", the situation is sensitive, so I'd rather not at this stage.
If, working with one or more of you via PMs (thanks Courtney) I can establish that its unlikely that he served, I'll have the quiet word re fraudulent CV then