My discs were warped quite badly, especially when slowing from motorway speeds.
The car was taken into Dixon Alfa south Leeds branch, and i explained what the problem was. Obviously i knew about the upgrade, however I didn't mention it.
When I went to collect the car, they said that their main technical guy had agreed that the brakes were warped, and before i had the chance to utter the word 'upgrade', he continued to say they were now speaking to Alfa to arrange a free upgrade to the brake system.
So, if your in the Leeds area, i'd recommend Dixons to sort out your warped discs!