Stop & Go type mushroom plugs are usually good for the life of the tyre. The lawyers blurb on the packet is just *rs* covering. Once the tyre starts to wear the plug self vulcanises into the tyre rubber and you can't even see it. I did 8000 miles with one fitted.
You will also find that in places the legal profession are yet to fully terrorise they will fit internal plugs. Puncture = New tyre only applies in London unless you do properly wreck one.
Andy
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