A tyre is allowed more than one repair, but not unlimited repairs and not anywhere. The general rule is that repairs must not overlap and must be separated from each other, because two units too close together leave a weakened strip of casing between them. In practice that means a tyre with an existing repair can usually take a second one on the opposite side of the tread, and cannot take one three inches from the first. It also means we need to know a tyre has been repaired before, which is why the standard expects the repair to be marked.
When we take a tyre off the rim, an existing repair is the first thing we look for, and the second is where it sits relative to the new injury. Sometimes the honest answer is that this tyre has done its share and a replacement is the sensible call, particularly if the tread is halfway through its life anyway. We would rather say that on your drive in Norton or Grange than fit a second unit next to the first and leave you with a tyre neither of us would be comfortable with. That decision is made with the tyre in front of us, not down the phone.
Sometimes the tyre is fine and the valve has failed. That is what we do first, on the drive in Pixmore or wherever the car has stopped, before anybody starts talking about repairs or replacements. We are out on the A6141 at 2am and in Jackmans at 2pm. Nothing about Lordship or Norton changes after dark, on the A6 included.

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Letchworth cars tend to do consistent mileage on the A505 and the A1(M) at junction 9 rather than huge annual totals, so tyres here often last long enough to collect a second puncture in their life. That is when the position of the first repair starts to matter. Knowing what is already inside the tyre is the reason we take it off the rim on the driveway.
Position decides it. On the far side of the tread it is usually fine. A few inches from an existing unit and the strip between them is doing too much work.
Repairs are supposed to be marked so the next person knows. Plenty are not, which is why every tyre gets inspected inside before anyone commits to anything.
At some point the sensible answer is a new tyre rather than a third repair on rubber that has a year left in it. We will say so plainly rather than sell you the repair.
Yes, within limits. Repairs must not overlap and need adequate separation between them, so where the second injury sits matters more than the count does.
By looking at the inner liner with the tyre off the rim. A compliant repair should also be marked on the tyre, though in practice plenty are not.
If the injury sits too close to an existing one, or the tyre is far enough through its life that a repair is poor value, yes, and we will tell you why.
Yes, across Jackmans, Lordship, Norton, Grange and Pixmore, with the tyre coming off the rim at the vehicle so the inspection is a real one.
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