Has anyone any ideas as to why my car suddenly veers off to the right or left when driving. How fast or slow i'm going it still does it. I have had the tracking done and also the wheels balancing but it is still doing it. any ideas?

sounds like your loer suspension arm has gone or known as a wishbone.
i would also try the following

open boot lid then hold can on the side of rear wing & pull n push to see if any play from side to side
if there is then the rear suspensin.swinging arm rubber has gone n needs replacing

they about £30.00 a pair from fords but a bugger to do if you dont have the removal tool