How the job is done
Found it flat in Newport Pagnell? Leave it where it is.
The flat is usually discovered, not felt. You come out to the car in Green Park and one corner sits low; a motorway driver returns from the services building to a tyre on the rim. The garage in town seems near enough to crawl to over Tickford Bridge. Driving even that far crushes the sidewall between wheel and road, turns a patchable nail into a scrap tyre and can mark the alloy as well.
Keep the car where it is, photograph the flat and its size code, and send the address or the car park area. With the car lifted and the wheel off, the leak is traced: a tread puncture repairable to BS AU 159, a failing valve, a rim seal on a corroded alloy, or damage that needs a replacement. You hear the price of each possibility on the call, so whatever the answer, there is no surprise.
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 in Newport Pagnell as well.
Not quite this? Read about broken tyre replacement in Newport Pagnell or wheel balancing in Newport Pagnell instead.