I still use filmdev (just sent an order to them the other day) - though it has gone up a little in price the last couple of years, understandably... I've also used Traia, Rapideye and Artful Dodgers in the past couple of years with positive results.
I've been using Carmencita in Valencia but only because I'm not in the UK. Their service is great though; supply digital images to you and send negatives later.
I still use filmdev (just sent an order to them the other day) - though it has gone up a little in price the last couple of years, understandably... I've also used Traia, Rapideye and Artful Dodgers in the past couple of years with positive results.
Filmdev is still my go to though.