Sorted took the caliper apart the seals had just come off,took the two pistons out cleaned all the housing,nightmare fitting the seals back on re-cleaned the discs.no warping at all the wheel turns fine,used a feeler gauge on the disc and spot on. Got a friend to check the wheels for the bearings and no movement at all.will check the other side tomorrow night for disc warpness.i still think the rear discs are bollocked though and that's causing the juddering