I have a friend who I'm slowly converting to the dark side (persuaded him he needed to buy a Fed for peanuts from a camera shop in Budapest when we were there, and now he's talking about picking up something like a Canon A1 - yay,) and I gave him one of the Ilford process envelopes after I'd heard they brought the service in-house; we were both very impressed with the results, so that's another vote of confidence from me.

Possibly counterintuitively I'd say it's a particularly good service if you shoot the C41 B&W films like XP2 - while the advantage of them is obviously that any old minilab can process them, the prints they produce often have strange colour casts: not a problem of course with Ilford's genuine B&W prints.