I had the same issue on my '09 Clubman early on. Can't remember the mileage. Crown said it was "normal". Stopped at MINI of Loveland, Co, for another issue, when out there for MITM/MTTS and mentioned it to them. They said it was the timing chain tensioner, but would have to order the parts. Since I was on vacation, that wouldn't work. Took it back to Crown, and they acknowledged there was a problem. Fixed it under warranty. Problem solved. I just traded for a '11 Countryman S All4 and the clubman was running fine at the time of the trade, 57.8 k miles.

I learned what was causing the noise from White Roof Radio.