OK, I replaced the ball joints and trackrod ends at weekend.
Rod ends was 9 turns off one side and 18 turns off the other, meaning I had more lock one way

So, I levelled them out, took the steering wheel off and centred it.
Now, when I accelerate, it pulls to the left and when I let off it pulls to the right. Been told this is a ripped engine mount, but they all seem fine, checked them with the jack under the box.
Also, think I might have tightened the steering wheel up too much as it doesnt self centre. If I turn it 90deg either way and let go, it just carries on