What happens
Beyond repair on the M25 and the car is needed now.
Some M25 damage leaves no repair option: a gash from lorry debris near the Thurrock freight routes, a tyre run flat from J4 into Orpington, a sidewall ripped open on a kerb in a Staines car park, with the site owner's agreement. On a working day the real problem is that the car has somewhere to be, whether that is a flight from Heathrow, a shift in Brentwood or a family waiting at Lakeside.
Send the complete size, load index and speed rating included, plus a photo. We source a matching tyre, load it with the balancer and drive it to the car. Once the ruined tyre is off and its replacement balanced, all three survivors get checked for pressure, tread depth and debris damage. If the partner tyre is close to the legal limit, you hear about it. Prices are confirmed on the call beforehand.
If the job turns out to be different, see burst tyre replacement on the M25, flat tyre help or locking wheel nut removal on the M25.