When I picked my MCS
up on 1st March this year I was really pelased with it. Took it home, drove around a bit, still loved it, then got a couple of niggling rattles and did feel quite disappointed as my previous Cooper had not had a sinlge rattle, squeak, etc., etc. Anyway suffice to say, I lived with the rattles for a month or so with them really annoying me and me listening out for every new rattle or squeak. Had planned to take it to the garage to be looked at, didn't have time but guess what? All the rattles etc. have now gone! I think it was just my car settling down. I had posted in a faults thread about my seat making a bad noise and the widscreen crackling sound but somehow both of these have gone and my car has not been to a dealers since I picked it up.
Give your car a couple of weeks and if the noises are still there, then take it to the dealers and see what they say. Otherwise, just turn the stereo up!