A string plug is not a puncture repair. It is a strip of sticky cord rammed in from the outside with the tyre still on the rim, which means nobody has looked inside the casing, nothing has been cleaned, and the cord is doing all the sealing on its own. It will hold air for a while. That is the whole of what it does, and holding air is the smallest part of the job.
A real repair goes the other way round. The tyre comes off the wheel, the inside gets inspected for the damage the outside never shows, the hole is reamed square, and a combined plug and patch is bonded in from within so the tyre is sealed from the side that matters. That is what the BS AU 159 standard describes. It is the difference between a tyre you can trust at seventy and one that is quietly waiting for its moment. We do it at three in the morning for the same reason we do it at three in the afternoon: there is no shortcut version.
The temptation at 1am is to pump it up and deal with it tomorrow. We come out at that hour in SW17, get the wheel off and inspect the tyre from the inside before deciding anything, then repair to British Standard where the damage qualifies. Old tyres leave Amen Corner, Furzedown and SW17 with us, every time. You watch it happen in Furzedown, or at the kerb in Bec Common. The SW17 postcode and a street in Bec Common: that is enough.

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Garages along the A24 shut at six, and a tyre losing air at nine at night will not wait politely until nine the next morning. That gap is the whole reason we run through the night. The car stays outside your house, the wheel never turns on a flat tyre, and the repair is done to the same standard it would get at noon.
The tyre had been plugged from the outside months earlier and had started weeping again. Off the rim, the cord had never been trimmed properly and the casing was open behind it. Only a real repair would close that.
Roadworks debris along Mitcham Road puts small screws into tread more often than anything else we see around here. Caught while the tyre is still holding most of its pressure, it is a straightforward hour and the tyre lives.
A slow leak noticed on the way home through the Broadway crawl, dealt with that same night rather than left to flatten on the drive. A tyre repaired while it is still up is a tyre that never ran on its sidewalls.
Tell us rather than hoping. We take the tyre off and look: if the plug sits in the central tread and the casing behind it is clean, it can usually be repaired properly over the top. If the cord has torn its way through, it is a replacement.
Around forty minutes for most cars once we are with you, because the wheel comes off, the tyre comes off the rim, the casing gets inspected and the wheel gets rebalanced before it goes back. The five minute version is the one we are arguing against.
Yes, every night of the year. Night calls are often the easiest ones we get: the High Street is quiet, there is room to lay a wheel down, and the car is back on its tyre before the traffic starts again.
Every few days of that is a few more miles run soft, and soft tyres cook themselves from the inside. Heat is what takes a repairable puncture and makes it a replacement. Topping it up buys a fortnight and costs you the tyre.
For the life it has left, yes. A repair to standard is permanent, not a temporary measure with an expiry date on it. What it cannot do is add tread, so if you were near the 1.6mm limit anyway, replacing is the honest answer.
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