please quickly look at the underlined text below to understand why the tyre might not be repairable.
In the UK, there are rules for repairing a punctured tyre..
Location
Repairs must be within the central three-quarters of the tread, also known as the "minor repair area". This area is between 60% and 70% of the tyre's nominal width, and it varies by tire model.
Size
The puncture must be less than 6 mm in diameter.
Safety
Repairs near the sidewall are not permitted because they may not be safe or last long.
Runflat tyres
Runflat tyres should not be repaired because it's difficult to determine if the interior structure is compromised.
BUT IS DOWN TO THE GARAGES DISCRETION.
If the puncture is outside of these guidelines, the tyre must be replaced