The job, step by step
Found it flat in Tring? Leave it where it is.
A flat can appear overnight. A car on a drive up in Wigginton or down by the canal at New Mill sits on its rim by morning, or a commuter walks back from the platform at Tring station to a tyre that has sagged all day. It is tempting to creep off in search of a garage, yet rolling on a flat, even from Wigginton down the hill into town, usually ruins it for good.
Keep it parked, hazard lights on if it is near the road, and phone with the address and the size printed on the sidewall. Once at the Wigginton or Aldbury car, the fitter jacks it up, pulls the wheel and checks the tyre from both faces. A clean nail hole in the tread gets repaired; a crushed or split casing gets a new tyre from the van. Both figures are spelt out on the call, so nothing comes as a 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 Tring as well.
Related help from the same Brent Cross team covers broken tyre replacement in Tring and emergency mobile tyre fitting in Tring.