Hi, I'm in the next town at Kings Lynn. My cupra has had a map on it since it was at 15k done by jabbasport at crowland, peterborough. It's now running a stage 2 custom map of theirs for the last 30-40k I'm now at 98k with no majors faults!
A friend of mine used Clive atthowae (bad spelling lol) at Norwich for his 1.8t golf with good results.
You may hear of A.Reeve in kings Lynn but I'd steer clear, he's an amateur mapper with only about 4 weeks experience mapping but advertising as a pro!! Plus I've heard he's selling generic load and go maps as his own custom maps!!