Thanks!
I think it was the inlet manifold. It was made of plastic whatever it was and took them several more days than they had estimated to fix it. A great deal of that was cleaning up the mess inside the engine .
The UK recall of lots of different models ws triggered by something that has happened in Korea. There were some rumblings about it being more likely to happen while hot. Not a dreak drizzly Scottish summer day hot, tropics hot.
I didn’t talk to BMW directly when it happened. On a 90,000 mile car bought privately and with some service history outside the dealer network, I just grumbled and paid.
Thanks for the advice. I’ll try the dealer that did the work, then BMW.
It would be ace to get some cash back, for the next time the car goes pop 🙂