Can a dealer change the agreed trade-in value of my car after signing a contract?

I've signed the paperwork to buy a new car on the basis of a very generous trade-in valuation. I think the dealer may have made an error, despite the price being agreed by the sales manager and being shown on my bill of sale. My car doesn't get built for a few weeks yet and I'm told my price is guaranteed. What are my right if the dealer realises they've dropped an £9000 clanger? Can they change the price on the basis of a genuine pricing error having been made? What should I do?

Asked on 20 August 2010 by cannyscot2000

Answered by Honest John
Yes they can on the basis of an unfair contract. HJ
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