I visited my local dealer this afternoon to feel them out. They advised me to take the accord to we buy any car and said PCP on used was about 9%, so that rules that out. It has to be new or bank loan for used. I'm really not sure about new or how it would work out, sorry monkeyhanger im not following 
Do you mean that you don't get what i'm saying about the deposit contribution and cashing in the VW finance?
Say for example drive the deal are offering £5500 off a new GTI that has a list price of £28500, bringing it down to £23500. That whole £5500 discount is dependent upon you taking out VW finance to get the VW finance funded deposit contribution of £2000. Without taking VW finance, drivethedeal offer £3500 off only and that car will cost you £25500.
You get your cheap loan set up with your bank.
You take out VW finance for the car, pick up the car and you then have 15 days cooling off period to cancel the finance (not the car, you've still got to pay for it somehow).
So what do VW finance want in settlement? £23500!

Even though you cancel the finance and settle with your private bank loan, VW don't get to grab that £2000 deposit contribution back. What does happen though, VW charge you daily interest on the amount until you request a settlement figure, it amounts to about £5 a day on that £23500 you owe them.
I did it last year with the wife's Audi A1. It had a £500 deposit contribution. I took out Audi finance to get the £500 and then rang the next working day to cancel the finance agreement and pay the balance.
It's easy and you won't get the deposit contribution unless you take out VW finance.