At the risk of jumping the gun I think the problem is sorted. Whoever done the tracking completely ballsed it up,the readings where way off when hooked up to the 4 wheel laser alignment. Was on the motorway home and no warning lights and the steering wheel is now centred, I hope that's the end of this. I have the before and after printout in the car.
and for anyone else wondering about the fitting markings on the tyres there is a TINY bit of writing on the sidewall with loads of different languages on it, the last language is English and it says exterior on it!