Boots in Plymouth still process C41 but the last two rolls of film I've had back have been disappointing - rather dark and/or strongly saturated colours. Unusually I couldn't be bothered to have a whinge about it. Either I was coming down with something or perhaps deep down I knew I'd be wasting my breath. The last C41 I had done and was pleased with was handed in to Dartmoor Photographic at Tavistock. They send out to a lab somewhere near Totnes apparently.