I had several rattles in my Dooper, mostly arising from various points on the dashboard. Booked my Mini into Woodmans at Blackpool, to get this Warranty work done. Got a courtesy car(Oxygen blue

) and my Dooper was in for 3 days. Woodmans found 5 rattles, and fixed them all. My advice is take your car back, and get your dealer to fix it.
Thanks to Dave and his great staff at Woodmans, my car is now Superb
