Me again!
Just spoke to Drive the Deal myself and got a quote on a 3dr Golf GTI with met paint, xenons, 18" wheels and 6cd/armrest.
Discount was about ?1900, or 9%. Not 11%, but they confirmed that was the price I'd pay. Delivery times to be confirmed, but estimated Mar/Apr next year. Deposit ?1000 + options = about ?2000.
My VW dealer on the same spec car recently offered me 2.25% discount (?500). Delivery time estimated 10 to 12 weeks. Deposit ?500.
So, the price difference in my case was ?1400, all of which I'd have to stump up front for the broker supplied car. Assuming a 6% per annum return on that ?1400 (before tax!) I'd earn about ?21 in interest whilst waiting for the car...
So, I can see why you might want to only leave ?500 in the hands of a car dealer rather than ?2000 to a broker, so that might swing it the dealers way. However, if you're after a "base" spec GTI, with no options, and don't mind the wait, then you might swing the brokers way.
Oh decisions, decisions!! [

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So, in summary, broker price lower, some discount available at dealer, bigger deposit required at broker, drive the deal won't take a trade in, dealer might get one a month quicker but neither can supply a firm delivery date - bugger!
Hope this helps everybody! I'm off for a lie down as my head hurts!!! Nurse?!!