As far as I can gather from reading the books that came with my Cooper, servicing, warrenty work, etc. can be carried out by any authorised MINI dealer (including the ones in Europe, if I understand correctly).
Don't have my books to hand at the minute to check the exact working, but I'm pretty sure that's what it said!

Don't have my books to hand at the minute to check the exact working, but I'm pretty sure that's what it said!