I've very recently revalidated by experience, and just sent off the form without a fee. Nobody has complained ... yet!
I nearly screwed the whole thing up, because I thought that my SEP rating was valid for two years from the date of licence issue - it isn't, it's two years from the date of the skills test pass. Luckily I chose the last day it was valid to talk to an examiner.
FWIW, I was told that, even though I had the necessary hours, had I not got the sign-off in time I would have had to have a flight test with an examiner (some will back-date the form, this one wouldn't) and after a flight test a cheque to the CAA is required. Nearly an expensive mistake...
