Just a quick update; VW have increased their contribution on GTI's from £1250 to £2000. You have to take their PCP finance to get this, and they've increased the APR on that to 5.3%.
Good news for me; I'm picking up the car on Monday and the above change makes it £750 less than I was expecting, huzzah!
My deal in summary: GTI manual PP, 5 door, Reflex Silver with DCC, Dynaudio and professional nav (i.e. Tech Pack), reversing camera = £25,957.
Bubba.