I'm Mini owner, I used to let them service my car for more than 1 year. they are good to have rent car with no charge.
But once I had let them carried out clutch replacement, I had spend more than $3xxx to get the job done and I found the gearbox had clicking noise sometime when I changing gear to 2nd & 3rd and also I found engine more noisy than before. I went back to them for further checkup, they found little piece of matel from gearbox oil plug. I said it wasn't like that before until the clutch replacement done. They refuse and say the gearbox issue wasn't cause by clutch replacement, I requested them to quote me for getting the gearbox fix, they never get back to me at all.
I have decided not to let them touch on my Mini any more and not recommend anyone even try them.