Just to add to this thread, I had a supposed 4 wheel alignment just over a year ago, through a Seat dealer and today I had a puncture repair to a rear tyre and it was so worn on the inside edge, i am going to have to replace the rears and probably the fronts as well, plus have the alignment done properly this time. I am furious about this, as the tyres on the front are only 6 months and 6k old and the rears would have lasted for at least another 20k if the alignment hadn't been so shoddy.
The alignment cost me £200 in the bargain as well, so beware of dealers offering this sort of service off site. I could go back to the dealer but they will only say the adjustment has gone out due to speed humps. Damn useless! Careful if you decide to go to a seat dealer in Croydon!
One thing with alignment at the rear, does anyone know how this is actually adjusted?
I had a quick look when the rear tyre was off today and couldn't see any place that could effect adjustment.