A repair to a tyre is covered by a British Standard BSAU159f:1990

which splits repairs into two categories - minor repairs and major repairs.

The British Standard also defines limits to the location, size and number of repairs

that can be carried out and makes recommendations also on the repair materials to be used.

A tyre must always be checked thoroughly before it is repaired.

If the tyre shows any of the following, it should not be repaired;