Well, I have just been out in my car for the first time in three weeks as I've been away on holiday. Sadly, I have to report that yet another stone got trapped in the front nearside brakes. I pulled away from traffic lights and heard the screaming noise and, of course, knew right away what it was. Could not stop as I was in a line of traffic but the stone came out after about half a mile of driving.
Reported this yet again, 5th time, to my dealer by email. At some point you would expect that they need to do something about this, but I won't hold my breath. Shame on BMW