Give a slow puncture a week and there may be nothing left to repair. A tyre running ten pounds under does more than feel soft. The sidewall bends further on every single revolution than it was designed to, that bending makes heat, and the heat breaks down the rubber against the inner liner. You can read it afterwards from inside the casing: a dark powdery band right the way round where the liner has chafed itself apart. Once that has happened it makes no difference where the nail is.
So an urgent call is not us being dramatic about a small hole. It is the difference between a patch and a new tyre, and it is settled by how long the tyre spent soft rather than by the size of the puncture. Position decides the rest: in the central tread it can be repaired properly, out on the shoulder or the sidewall it cannot. Getting to you sooner is what priority buys. Nothing about the repair itself is done any faster.
The car has to work tonight. Urgent jobs go to the front of the queue and the van comes to wherever the car is standing in UB1, typically inside 30 to 60 minutes with a live ETA. Blocked drive in the Western Road area? Open kerb in Norwood Green? Either works. Which street in Norwood Green, which way the car sits in Dormers Wells, and we are set.

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Congestion is what makes a slow puncture expensive around here. Every crawl along The Broadway or the A4020 is another few miles run at the wrong pressure, and stop-start traffic is where the heat builds rather than where it clears. A puncture picked up at the start of the week and ignored until the weekend has usually cost you the tyre. Dealt with the same day, it costs you a repair.
Topping up at a forecourt twice a week is not managing a puncture, it is running the tyre soft in between. That is the routine that turns a repairable hole into a scrapped casing.
There is no version of that morning that works with a flat tyre and a car seat to shift. It goes to the front of the queue, and it is normally dealt with before the road outside has cleared.
Narrow streets collect whatever falls off everything using them, and a screw standing head up will go straight through a tread block. Caught the same day, that is a repair and nothing more.
The inside of the tyre tells us. Once the liner has gone powdery, or the inner face of the sidewall feels soft and rubbery, the casing has been cooked and no patch will make it safe again.
Typically between thirty and sixty minutes, depending where you are and what the roads are doing at that moment. You get an honest time on the phone rather than a number designed to keep you holding.
No. A plug pushed in from the outside, with the tyre left on the rim, means nobody has seen the half of the tyre that decides whether it is still fit to use. A stem and patch bonded from within is the proper job.
Not automatically, but do not drive on it. A tyre that went down while parked is usually still fine. One driven a mile flat has had the bead scrubbed and the liner destroyed, and that one is scrap.
Only if you are somewhere you cannot safely wait. Space savers are limited to fifty miles an hour and are not meant for daily use, and changing a wheel at the kerb in this traffic is a bigger risk than sitting tight.
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