Thanks for the concern, everyone!
Everybody [including car and even the wheel!] unharmed. Obviously car wheel and tyre are going in for a checkup/investigation tomorrow.
My son [23] was driving when it happened - I reckon he did quite well to keep it on the road, and had the good sense not to hit the brakes too hard.
I wasn't with him, but I have 'heard the testimony'
of those who were, and despite some initial parental cynicism, definitely no signs of anything until the bang, and no excess speed etc etc.
Tyre was a Vredestein Sportrac, which [like the other 3] until this incident had performed so well, I was thinking of replacing with the same. Will wait for a professional opinion now! None of them had been punctured/repaired.
We are having some building work done at home, and I wonder whether it might just have picked something up on the drive...
All's well that ends well
@ Will - first the tennis ball, now this
Enough already