You guys in the UK don't realise how good you have it.
Here in Ireland, the GTI CS is 52.5k. The R is another 11k. Spec either of those up and you're into pretty crazy money. Oh to have the 40k "luxury car tax" problem!
Discounts here are small. You'll need to deal directly with individual main dealers. If you manage a discount of 2.5 - 3k you'd be doing well. There's no concept of a "broker" here in the car buying game. I guess our market is much too small for a Carwow type of model.
Road tax - the CS just about sneaks into €420 per annum. The R is €600 p/a. If you're feeling flush, a Tiguan R costs €2,400 p/a to tax.
On the plus side, I think our finance rates and deposit contributions tend to be better than you guys typically get. The GTI / R is currently at 1.9% APR. It has been available at 0% on and off in the past.