I can't help with where to use but can with where NOT to use.
Don't use the gearbox place in Erith, had major hassle with this place, they even snapped the aerial on my car whilst there but didn't say anything, just threw the aerial in the car, this was after a autobox repair that lasted 15 miles before losing all drive and needing a rebuild, they screwed me for a gearbox case that had a hole in it, and charged me for one they got from a mate £200, it was a piss easy fix by welding anyway.
tabetha