There is a British Standard covering permanent puncture repairs, BS AU 159, and the useful thing about it is what it rules out. It rules out anything pushed in from the outside without removing the tyre from the rim. It rules out the shoulder and the sidewall completely. And it requires that somebody actually looks inside the casing itself, because a tyre driven even a short way with no air in it can be ruined internally while looking perfectly fine from the pavement.
Which is why the hour we turn out at genuinely counts in NW3. A puncture discovered at eleven at night is, nine times in ten, a repair. That same puncture after you have crept down Haverstock Hill on it at half seven hoping to reach somebody who is open, is frequently a new tyre instead. We would rather come while it is still the cheaper of those two outcomes, and these gradients are the last place anybody should be nursing a soft tyre.
An overnight repair follows exactly the same standard as a daytime one, and it is worth being clear about that. Where the damage falls outside the standard you get told at that hour and a replacement goes on from the van, on the drive in Swiss Cottage or wherever the car is. A Swiss Cottage cul-de-sac or a South End Green main road, tell us which. A tight terrace in Gospel Oak or a narrow bay on Haverstock Hill is usually workable. Belsize Park, Royal Free Hospital and the streets around Swiss Cottage are minutes apart.

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Hampstead is quiet enough after midnight that a repair outside your own front door is straightforward, even on the narrow stretches near the High Street where daytime working would be impossible. The car has not moved, the tyre has not been driven on, and that combination is what keeps a puncture repairable.
Found flat outside the house after a late finish. The nail sat dead centre in the tread with the tyre still soft rather than empty. Off the rim, inspected inside, plugged and patched, rebalanced, back on. The owner drove to work on it the next morning without thinking about it again.
The driver had been quoted for two new tyres elsewhere and rang us expecting the same answer. The injury was central, small and clean. We repaired it to standard and told them the second tyre had years left in it, which was not what they had been told.
Losing pressure over about four days, with nothing visible in the tread. In the water bath it turned out to be a hairline split at the valve rather than the tyre at all. New valve, rebalanced, problem gone. Not everything that goes down is a puncture.
Because half the information is inside it. You cannot see whether the liner has been chewed up, or whether the object went in at an angle, from the outside. A repair done blind is a guess.
Yes, all night, every night of the year. It is not an answerphone arrangement.
Most single punctures run 30 to 60 minutes on site, including getting the wheel off and balanced again afterwards.
Maybe, maybe not. A few hundred yards at walking pace is often survivable. A mile at speed usually is not. We will look and give you the real answer rather than a comfortable one.
It gets treated carefully and reused wherever it can be. The main thing that kills them is aerosol sealant, which is one of several reasons we do not use it.
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