At the car
Beyond repair in Croydon and the car is needed now.
Some Croydon tyres are beyond help: a sidewall pinched on the tram rails at Sandilands, a tread torn off after a blowout on the Coulsdon bypass, a puncture driven flat from Norbury to Thornton Heath. When the car is the household's only one, or the van that works out of Purley Way, waiting three days for a depot slot is the problem. This page is for the morning the tyre is dead and the day cannot be moved.
Send the sidewall marking in full, a photo of the damage and the Croydon postcode. The fitter checks his rack for your size, or names a supplier he can call at on the way to CR0, gives a single price for tyre and fitting, then fixes a time for New Addington or Purley. On the estate road the ruined tyre is cut off, the replacement seated and balanced, the nuts torqued, and the remaining three plus the spare are looked over so a second callout is not needed.
Related help from the same Brent Cross team covers burst tyre replacement in Croydon and broken tyre replacement.