I went to an optimologist, or optomologist I don't know. Thought they were opticians. Anyway, he checked my eyes obviously and they weren't perfect. Although I was getting them checked for the purposes of a pre CAA Class 1 medical check he said he got a lot of pilots in due to his location and that I'd be fine even for the RAF despite them not being dead on. Only £20 and there's bound to be someone near you who can do similar.
Not sure about the RAF's limits or their opinions on laser surgery. I hear the CAA aren't too keen on LASIK and the like so the RAF are bound to have some views. Bit vague but all I can muster I'm afraid.
G