Cheers DW...!
I take my film to David Lipson Photography in Great Dunmow, Essex for processing. Unless it's C41 compatible, it takes a week to turn it around but that's not a problem for me as I can always fiddle with my digi stuff for a while (;o)). For anyone in the north Essex / east Herts area, I can definitely recommend David Lipson's.
The negs always come back clear and mark-free and the prints Mike Perry (who owns the shop) has done for me in the past have always been excellent. Okay, it's a little bit costlier than Snappy Snaps and it's not as quick - but I'm a low volume user and seldom shoot for anyone else's benefit these days, so I don't mind waiting for good results.