Hi, Jem and Emma, thanks for your replies. The magazine is "What's on TV". I don't have a phone number but I will try and find one. I know it's only £25 but every penny is precious to struggling authors!
Somehow I don't think I'll have much luck with getting paid though. It's such a small amount and some banks charge to cancel cheques. Probably not worth while WOTV setting up an electronic transfer either.
It all comes down to money in the end.
Anyway, if I can find a number, I'll give them a ring...