GTT are within easy travel of you IMO...worth the little bit of a trip. Some people come from as far as Scotland to have Rolands kit fitted!
TBH any good garage can fit the stuff if you buy it from Lohen, GTT or others.
I'd suggest a 15/17% reduced pulley (including the colder irridium sparks and reduced belt) plus a Alta or GTT cold air intake and a milltek/janspeed/GTT manifold with GTT reroute pipe or exhaust.
Then think about intercoolers and other stuff depending on your budget.
The CAI and the exhaust stuff is simple for a mechanic. The pulley is a bit more technical as you need the right tool but i'm sure someone in Kent from MINI2 will have one
