What happens
Found it flat in Harrow? Leave it where it is.
Commuter cars parked all day near Rayners Lane and North Harrow stations can come back to a flat, because a slow leak has eight hours to finish the job. The bays are controlled and the streets narrow, so people try to nurse the car home along the A404 Pinner Road. That is how a nail in the tread, a straightforward repair, becomes a crushed sidewall and a tyre in the bin.
Keep the car where it is and ring with the street and the tyre size. If the bay's permit hours are about to bite, say so and the fitter plans around it. The tyre comes off, the cause is found, and the fitter says whether it is a repairable puncture to BS AU 159, a valve or a bead leak, or damage that needs a replacement, with the cost of each option given on the phone before any work is done.
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 Harrow as well.
Need something else? Our pages on broken tyre replacement in Harrow and new tyres fitted in Harrow explain those jobs.