[tyreman]

if a repair is necessary it must be carried outas soon as possible after the damage occurs,early removal increases the possibility of a successful repair.
REPAIRS PERMITTED
2 repairs per tyre in tyres up to and including j speed rating(62 mph)repairs on j rated tyres must not exceed 6mm in diameter.
1 repair per tyre above j speed rating,up to and including v speed rating(150 mph)
repairs on tyres above j speed rating and up to v speed rating must not exceed 3mm in diameter.
the repair must be restricted to the tread area(eg central 3/4 of tyre tread)using a mushroom type plug.
no repairs are permitted above v speed rating(150 mph) in accordance with bs159f

hope this helps

tyreman