Thanks for that. Seems although the belt was well in line and looked fine the actual wheel wasnt.
It was actually going up the road a bit crab like so i had another look and carefully aligned the belt and the wheel by ensuring adjusters where exactly the same length.
steering wheel (brooklands) is still offset but car is super straight, it doesn,t pull either way even at 70mph with hands off the wheel so i think im sorted. Cheers
