Yes, tyre plugs are legal in the UK. However, it is important to note that tyre plugs should only be used as a temporary fix, and tyres should be replaced as soon as possible.
How do tyre plugs work?
Tyre plugs work by inserting a plug into the puncture hole on the tyre, which is then secured with a patch. This seals the hole and prevents further air loss. The patch is then covered with a sealant to prevent further air loss.