Mine been in the dealers because of this problem and they fitted a new 'window surround seal' as the mechanic found this was 'twisted' in the factory. Had a underpower polo for a couple of days while they looked into the problem and glad to have my lovely GTD back! The garage is in Crystal Palace, London and they seem on the ball.... However, due to their location there is no way of getting above 40mph within 10 miles to test its fixed tonight. So, I'm going to take it out on a motorway tomorrow and see if this new seal solves the wind noise. I'll let you know......