I think i've got it sorted.
Big thanks to christian by the way for looking into things for me
I've located a set of 1144's for the track taxi ! Ferodo do not do the 2500 compound for the hatch, just the 3000 which i think will be a bit too hard !
Looking around various forums, the 1144's seem to have a fairly good reputation, apart from being a bit dusty and squeally, but i can live with that.
Proof of the pudding is in the driving, so once ive bedded them in, we'll have a go at donnington !
Thanks again EVERYONE for help & advice, your all Stars !!!!!!
Matt