What happens
Found it flat on the M6? Leave it where it is.
Flat tyres near the M6 tend to be found once the car has been standing: a commuter returning to a Rugby car park, a driver back from a break at Corley to a tyre on the rim, a family car on a Nuneaton drive that sank overnight. It is tempting to use the forecourt air line and head for the motorway, but on the smart sections, with no shoulder to fall back on, a tyre that went flat once is a real risk.
Leave the car exactly where it stands and phone with the location, what the sidewall says and whether locking nuts are fitted. Once the fitter arrives, the wheel comes off and the tyre is examined from inside. A small hole in the tread's central area is repaired to BS AU 159; otherwise a replacement goes on. As the van travels from north London, both options, their prices and the journey are discussed before anyone sets off.
On run-flat tyres? They behave differently once deflated, so check the handbook's limits and read our page on run-flat tyres; we fit replacement run-flat tyres at the car near the M6 as well.
Not quite this? Read about broken tyre replacement or emergency mobile tyre fitting on the M6 instead.