Well the car is booked back into BMW for rear ambient light issue in the exact same place they repaired two months ago for a rattle. I've also mentioned that there's an issue of the brake pedal going solid on occasion when parked up overnight. It isn't every time (happened probably 4 times since I bought it in May) and can be after it's parked up for a couple of days, or simply overnight. It used to happen on the Focus, it was fairly common on them and I believe it was an issue with the master cylinder.
I'm not hopeful of BMW being able to diagnose and resolve it as it's seemingly random, has anyone else had this issue with the F30?