i have used two in or around Derby...
Burton Motor Workshop (BMW) in Burton on Trent. Friendly staff, got my first service there.. recoded my car for £25.... ex BMW and merc staff.
Then more recently i used Hugh Brothers http://www.hughesbrothersbmw.com/ in Derby to lower my car, and will prob take it there for my next interim service. Cheaper then Burton Motor Workshop and the staff again ex BMW.