Agree with Nick.
If you cant make the trip to r-tech (which you really should) then see John at Bigfish. Heard a few good things from his maps, mainly on vagcars.
My friend had her GTi mapped there, and leon, and when she drove mine she thought a R-tech map was better and much smoother. Not saying its bad, but thats what she said.
I certainly know where i would go, and there is only 1 place in the UK that I would allow to touch my ECU with a mapping tool. - R-tech.