New Zafira (Oct 2012) had steering which veered to left on a straight road, reported to dealer. Had to fit winter tyres and wheels before they could correct it, problem went away.

Now back on original wheels & tyres, veered to the left again; dealer just had the car in to test tracking on their "state of the art equipment", say they found a fault and corrected it. Steering still veers to left even on right-hand camber. I'm sure they honestly tried, but is there anything they might have overlooked? And any reason why the winter tyres and wheels seem OK?

(Sorry, I stupidly did not mark the original wheels when taking them off in November so do not know if they are back on in the same order). Winter tyres superb by the way, thanks for your advice.