The job, step by step
Found it flat in Croydon? Leave it where it is.
Most Croydon flats are found cold in the morning: a car on a permit street in Addiscombe after a late train into East Croydon, a van on a Waddon forecourt, a family car on an Old Coulsdon drive. A screw from Purley Way or a corroded alloy bead seeps air over a week and gives up on a cold night. Rolling the car even to a Purley Way bay on the rim chews the sidewall and turns a patchable tyre into scrap.
Give the postcode, the road, which wheel is down and whether it has moved at all since. The fitter brings a compressor and a jack to CR0 or CR5 and hunts for the leak with the wheel off. Screw in the tread centre: patched from inside. Tired valve: swapped. Corroded bead seat: cleaned. A cut sidewall, or a tyre rolled flat along Brighton Road, means a replacement from the van. Whatever it turns out to be is priced with you before the wheel comes 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 in Croydon as well.
Related help from the same Brent Cross team covers broken tyre replacement in Croydon and new tyres fitted in Croydon.