Possibly Dim PCP Question

[Tim330]

Thinking of getting a new car and have spoken to a dealer about prices. I mentioned I may want to px my current car which I guess is worth about £8k. Looking at some pcp topics on PH & other sites the general recommendation is to place a low deposit as you don't save much overall.
Will a dealer take some of the deposit value from my px car and give the rest as "cashback" or is this not how it works?

[Tim330]

Thanks. I will ask the question when I visit at the weekend.