I have just ordered a 5-door GTI in Diamond Black with DSG, cruise control, MF Steering Wheel, Ipod prep, and 18" Monza II. Post-haggling, the total price was £23k on the road - a saving of £1,207 against the list price.
Delivery for 1 September, allegedly!
I'd suggest using the What Car Target price as a starting point when you haggle - go in with a copy showing £890 discount, and tell them you want to use the dealership, but can't afford to through away money......! My dealer was actually very easy to do business with - but was very clear that I wouldn't get any discount on an Ed30!
Good luck.