So today I took apart the calipers on both sides and put some copper grease on the sliding pins, and they are both moving easily now, but one of the pins on the drivers side was seizing in there, it moved with alot of force, And it was affecting the disk.
I still have the problem of it going to the left side, If I drive on the right lane of the dual carriage way, it is fine, steering stays straight, maybe a little tiny bit of wondering off to the left, but hardly noticable at all.
If I drive over a slightly uneven road surface, the steering will pull to the left.
My power steering feels very sensitive as well, I dont know if it supposed to be that way or not. I have checked the fluid level and that is fine. I notice it more while driving over about 50mph, but if i move the steering wheel say 10mm either side, I can feel the car swaying a little.
I don't know what else to try.

Could having the brake problem have knocked the tracking out again?
Or is there something else that I need to do?

Cheers