One of the more common things we find on inspection is somebody else's repair. Usually it is an external plug, a rubber worm pushed through the tread from the outside without the tyre ever coming off the wheel, and the driver has no idea it is there because it was done before they bought the car. It seals well enough to hold pressure, which is exactly the problem.
What it does not do is support the injury or prove the inside of the tyre was undamaged. So when we take a tyre off around SW11 and find one, the recommendation is to redo it properly from the inside, or to replace the tyre if the plug has been sitting in a position that was never repairable to begin with. You get shown it either way. Nobody is trying to invent a problem, and if the old repair turns out to be a correctly fitted internal patch we will say so and leave it exactly where it is.
"It still drives fine" is true of almost every dangerously damaged tyre we replace. We do that where the car is parked, in Clapham Junction, Shaftesbury Estate or anywhere in between and fit the correct replacement on the spot if that is what it needs. Same tools in Clapham Junction as in Shaftesbury Estate, same on every call. Valve in Shaftesbury Estate, balance in Lavender Hill, pressures before we go.

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Battersea has a lot of cars that have passed through several owners and several quick fixes, and the streets around the Shaftesbury Estate and Battersea Rise are packed tightly enough that nobody is inspecting tyres closely between sales. An old external plug is a common find and a genuinely worthwhile one. We would rather show you what is inside the tyre and let you decide than fit anything without explaining it.
A tyre on Lavender Hill turned out to have an external plug from a previous owner. It was redone properly from the inside.
A car near Battersea Rise had been plugged in an area that should never have been repaired. The tyre was replaced.
A tyre on Queenstown Road already carried a correct internal patch. It was left alone and the driver was told it was fine.
It seals the hole without the tyre ever being taken off, so nobody has checked the inside and the injury has no support. It holds pressure, which is what makes it deceptive.
You usually would not. They are visible from the outside as a small rubber tail in the tread, but most are trimmed flush and only found when the tyre comes off.
Often, yes, if the position was repairable to begin with. The plug comes out, the hole is prepared and a combined plug and patch is bonded from the inside to BS AU 159.
No. If we find a correctly fitted internal repair we will tell you it is sound and leave it. Plenty of what we inspect around here needs nothing at all.
Yes. If a tyre is coming off anyway, looking at what is inside it costs nothing and often answers a mystery slow puncture.
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