What happens
Found it flat in Tower Hamlets? Leave it where it is.
Flats show up overnight across E2 and E3: a nail from the A11 that seeped for a week finally gives out in an estate car park, a valve fails on a car left a fortnight in Stepney, a Bow driver finds the rim sitting on the ground before the school run. Driving on it, even the short hop to Bow Road, crushes the sidewall between road and rim and makes a repairable tyre a dead one, and the red route outside offers nowhere to stop anyway.
Call 07473 720871 and say where the car is and what you can see: fully flat or just low, any nail or screw visible, whether the tyre has been driven. The fitter arrives with a compressor, a repair kit and a stock of common sizes, lifts the wheel off and decides at the car whether a patch-plug from inside will do or a replacement is needed. Either way the cost is confirmed with you before the work begins, and the whole thing happens at your bay.
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 Tower Hamlets as well.
Related help from the same Brent Cross team covers broken tyre replacement in Tower Hamlets and locking wheel nut removal in Tower Hamlets.