Sometimes the answer is that the repair is perfectly legal and still the wrong thing to buy. A tyre sitting at two millimetres has passed the letter of the law and has very little working life left in it, and sealing a puncture in it means paying to have the wheel off, the tyre stripped, a patch fitted and the whole thing balanced.
Then the tread reaches the markers, the tyre comes off, and all of that work goes in the skip with it. You have bought two visits instead of one. Worse, wet grip does not fall off a cliff at 1.6mm. It declines steadily from about three millimetres down, and the last stretch is where stopping distances in the rain get genuinely long.
We will still do it if you want it done. It is your car and it is a legal repair. But you get the gauge readings and the arithmetic first, because a fitter who seals that hole without mentioning any of it has taken payment for something that will be scrap by autumn.
DVSA-compliant is not marketing language, it is a description of the method. We do it that way every time, at the car anywhere in SE6, and where the damage falls outside what the standard allows we say so and fit a replacement instead. School run in Bellingham or 1am in Hither Green, we answer the same. Christmas Day in Southend, any day in Rushey Green: the line is open.

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There is a great deal of wet braking in Catford. Rushey Green and Bromley Road are stop and start most of the day, and the junction with the A205 South Circular asks you to lose speed quickly in whatever weather is happening. A tyre near the limit does that badly, so we measure at the kerb before saying anything.
A nail in the middle of the tread, perfectly repairable, in a tyre with almost nothing left above it. We measured, showed the reading and said what we thought. The owner went for a new tyre instead.
A driver near Bromley Road already had a full set booked for the following week and simply needed the car until then. That is a good reason to repair a worn tyre. We sealed it, said what it was buying, and everybody knew where they stood.
One tyre near the markers with its partner on the same axle barely used. Sealing the worn one would have left a mismatched axle for a few weeks and then cost another visit anyway. Two went on and the car braked evenly again.
We will, if you ask. What we will not do is take the job without telling you the tyre is nearly finished. Legal and worth keeping are two different tests, and only one of them is written down anywhere.
A few thousand miles of ordinary driving, and less if the car does mostly short trips at town speeds. It varies with the tyre and the car, which is why we measure rather than estimate. A repair does not extend it by a single mile.
No. A proper plug and patch to BS AU 159 lasts as long as the tread above it does. The problem with a worn tyre is nothing to do with the repair. It is that there was never much tread left to protect.
Yes, and it is the part nobody notices until they need it. Tread grooves exist to move water out from under the contact patch, and a shallow groove moves less of it. Braking distances lengthen well before the tyre becomes illegal.
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