also my repmap only cost 350quid and the guy came to my work with his computer!! haha
A guy turning up somewhere with a laptop doesn't inspire my confidence.
I agree. I had emission and pinking problems on my previous car when a man with lappy came to remap.
I also looked at Celtic Tuning and nearly got sucked in by the 265bhp/£350. I asked if he had a dyno, he said yes but its in Ireland. I also asked for a torque/BHP graph for his remap. After a couple of reminders he did email me one. It was exactly the same graph that is on the Milltek website showing the curves for a GTI with a full Milltek

If the map is written over by VW after a service etc.. he charges £50 for a reflash. If that doesnt work and he needs to send the file away, it's £120 for the reflash.
After doing much research, in my opinion Revo seemed best. It was £240 more, but to me it was worth paying the extra. They have good tech support and the reflashes are free.