What happens
Tyre trouble on the M40 after hours, repaired where the car is.
Night punctures near the M40 turn up after long days: a nail found on getting home to Thame, a warning light on the drive back from Birmingham, a soft tyre discovered in an Oxford hotel car park. The car might creep a short way, yet a conventional tyre bleeding air until dawn often ends up past saving, and a run-flat driven on is finished regardless.
The moment the warning lights, pull off and stop. Beside the car, wheel and tyre are separated and the liner checked by torchlight. Anything up to 6 mm, clear of the tread edges, takes a patch-plug to BS AU 159, then the wheel is bolted back to the correct torque. Run-flats that ran deflated get replaced. The repair cost is stated on the phone and matches daytime work.
If the job turns out to be different, see locking wheel nut removal on the M40, flat tyre help on the M40 or burst tyre replacement.