You must be very tall; if I put my seat to it's lowest position I can't see over the dash [slight exaggeration, I am 5ft 7"], but seriously, I know you say you've tried adjusting the seat, but have you taken it to its lowest position?
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Yes I have put the seat as low as it will go. (This is actually too low to see over the dashboard satisfactorily).
Sat in a GTi today and adjusted the seat position and height to suit me. Perfect! ...................... Then I measured the seat size, height and position relative to floor, pedals and steering wheel. Exactly the same dimensions as I have the seat set to in the GTD!!!!!!!!!!!!!!!!!!! Conclusion = crap seat in the GTD. Now looking at Trading the GTD in for a GTi. (Fitting GTi seats in the GTD = over £1000 each from VW!)