Broke through 1200 miles tonight! So GBMINI is now officially run in.
Good – the performance and power is great, but you can feel the car really starting to get keen around 4500rpm, which is when you are supposed to stop during the run in period.
Visited MINI Peabody today to have a few details dealt with. As always, perfectly excellent service and everybody friendly. They solved my “wet seat belt” and replaced the boot round the handbrake (cut through by a bolt which now has a rubber end cap on it); they also appear to have eliminated a vibration from the passenger door area. Saw loads of other MINIs around – there will be lots more happy Boston area owners soon 🙂
M&I / GBMINI 
How did they fix your “wet seat belt” problem at MINI Peabody?
Can’t remember the exact details but they found an issue with the seal around
the bottom of the roof / top of the car / door pillar area and re-sealed it.
When they disassembled the B piller inside the car, they could see the water
track – I think that was a good clue.