Every so often a tyre is condemned because of what somebody else did to it. Take one off the rim and there, on the inside, is a mushroom of grey rubber where a string plug has been forced through from the tread, or a patch that has lifted at one edge and is sitting on a liner that was never cleaned properly. Both are common and both mean the same thing: the tyre cannot be trusted and cannot be repaired again in that spot.
The reason it matters is that the driver almost never knows. A repair done badly holds air perfectly well for months, so the tyre feels fine right up until it does not, and the failure gets blamed on the road. When a call comes in about a slow leak or a strange bulge and the inside tells that story, you get shown it. It is not a comfortable conversation, but it is the difference between understanding what happened and buying the same problem again from the same place.
The damage does not care where the car is parked, and neither does the fix. A driveway in South Mimms, a work car park, a kerbside bay: the van brings the tyre, the jack and the balancer to all three. You watch it happen in Oakmere, or at the kerb in Cranborne. Same tools in Little Heath as in South Mimms, same on every call.

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Plenty of the tyres written off around Potters Bar were damaged in a bay rather than on the road, and the evidence only appears once the tyre is off the rim. That is why every repair here starts with the casing being read from the inside. If it is sound you keep the tyre, and if somebody else has already ruined it you get to see exactly why.
A tyre off a car in Oakmere had been plugged from the tread by somebody else. The liner was torn and the belt beneath it had started to rust.
A slow leak on a car near Cranborne came from a patch that had never bonded properly. Air was tracking out around its edge.
A driver near The Walk was braced for the same story and got a clean casing instead. The leak was at the valve and cost very little to put right.
Usually you would not. It holds air, the car drives normally, and the only place the evidence sits is the inside of the casing.
Sometimes, if the liner around it is intact and the belt has not corroded. Often the damage from the first attempt is what ends the tyre.
It seals the hole and leaves the steel belt exposed to water inside, and nobody has looked at the casing to see what the object did on its way in.
Yes, on the tyre. You should be able to see the reason for any verdict rather than take it on trust.
Not necessarily, but if they were done at the same time it is worth a look while the fitter is there. It costs nothing to check.
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