The job, step by step
Found it flat on the A205 South Circular? Leave it where it is.
Streets off the A205 are full of cars parked for days in residents' bays, from Clapham South to Tulse Hill and East Sheen, and a slow puncture has all the time it needs to empty a tyre. Visitors return to Kew Gardens or Dulwich Park to the same sight. The easy answer seems to be a short drive to a forecourt on the South Circular, but the red route leaves nowhere to stop if the tyre gives out, and rolling on a flat ruins it.
Stay beside the car, or at least nearby, and send the street, the bay type and the size. The fitter traces why it deflated: one nail through the tread face gets a BS AU 159 repair, a corroded valve is changed, and a sidewall crushed by being driven flat gets a replacement. Nothing is decided over your head; you hear the options and the price before the jack goes under the car.
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 A205 South Circular as well.
Related help from the same Brent Cross team covers broken tyre replacement on the A205 South Circular and locking wheel nut removal on the A205 South Circular.