But how can he make a hp or PCP deal "suit"?
He can't change the interest, he can't change the gfv (for PCP), all he can change is the agreed price...
I suppose he can try to tempt you into taking four years rather than three and hope you are daft?
There's 4 years instead of 3, as you suggest (more and more people seem to be doing this as prices go up and up), or alternatively, if the salesperson gets you a deal that can come out at £380pm and you've said you have a £400 budget, they'll make damn sure they find a way to get you to spend the other £20pm by slipping in a high commission product like lifeshine or gap.
My favoured salesman at Pulman told me he'd make £41 commission on my Golf R , but he makes £60 on every lifeshine he sells or manages to give "free" if there's enough margin left on your deal to do so.
Another way to clinch the deal is variable GFV. Not seen this at VW, but saw it going on at Audi when we bought the wife's A1. We took finance to score for the deposit contribution and settle within 14 days. I was playing along as an interested PCP buyer. He was pushing the "hiw much a month can you afford?" angle and I said if the deals right, the monthlies look after themselves. He increased the GFV figure by £600 to save £15pm, but I bet there's a flag on the system to remind them to offer very little equity at p/x time.