I now remember reading about this on a long term MK6 GTD Autoexpress had.
They also found that quite a few readers suffered it as others wrote in about it.
They also found quite a few of them the geometry was set incorrect from the factory.

Im suffering what sounds like you are all talking about with only 8000 miles on the car with bridgestone tyres fitted. I will be checking the tyres at the weekend for the 50pence shape!