Different speed ratings at Halfords, they only sell the quick stuff.
Is it to go in a Jag Mostly Harmless (if you can say)
Sad thing was when I was at Cranfield, the company I worked for had gone bust, and we were in collecting our tools etc, we used to get the odd bit out of the colleges skip with their permission and on that day when I had no longer anywhere to stow them, what did they throw out but a pair of complete Buccaneer seats.