I got a good deal from Holiways on an ST-2http://www.holiways.co.uk/ (Darlington and Durham) i think are really good. Always take my car there even though it's a 40 mile trip. They are mountune approved as well
http://www.cramlingtonford.co.uk/ Cramlington ford are also an approved mountune dealer but ive never used them and the last time i went past the garage looked small with no ST models for sale however i know they've recently sold an RS so they might just keep a small stock of cars there due to the size of the garage.
Peter was very helpful on the phone but unfortunately couldn't come close on price. I expect they'll be getting my service/mountune work though.Cramlington Ford might be small but good service one of the owners has a PBthey have quite a fews on the books from Ford Direct