I've leased two Mini Coopers (the first in 2003) through Nick Alexander and have had consistently good experiences here. Phil Gibson, the service advisor, is extremely knowledgable and takes the time to inform you of what's going on, what the car needs and what your options are. Yes, it's a bit of a schlep from where I live, but they've always offered me a loaner car (for free) or a shuttle ride home. I really like the new dedicated Mini facility too.
more