"local MOT place" hmmm, sounds dodgy to me. Did they feel warped? Did they use VW approval parts for replacement, or non genuine? What was the mileage between warping, or was it conveniently when you had an MOT? Has the car been to VW main dealer recently?
I was in a Kwik Fit a few years ago and overheard an employee saying to a guy with a 2 year old Audi with 9000 miles miles on he needed ALL new round discs and pads. Total BS, the car was fine, just money making.
On my Mk5, I did 40,000 miles on original discs and pads, current Mk7 is at 32k on original discs and pads.