Mytheroo said:

no they don't, because it's not a required standard is it. If it was, they'd check for plugs and require a certificate of internal plug repair for each plug.

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That’s not why they don’t remove tyres. They don’t remove tyres because removing all 4 tyres (5 if you’ve got a spare! Look at me keeping on topic!) would cause more accidents than it might help to prevent. Then there are also liability issues for rims damaged during removal/fitment of tyres.

An exterior plug might be safe, it might not be. An external plug fitted as per the BS is always going to be better.

The main thing is find with a proper repair would be much higher strength of repair and meaning it's nearly impossible for the repair to fail again like can happen with plugs Alone they can come loose or get ripped out