Are there any sports cars which don't depreciate heavily?

I'm thinking of spoiling myself and spending £40,000 or more on a retirement present. So which sports car would you recommend that will not lose money long-term? Perhaps going for something like a Porsche...

Should I haggle when buying a sports car such as an Aston Martin DB9 or Ferrari California?

Having read the interview in last weekend's Daily Telegraph I was surprised to read you have already spent 18 years offering your services to readers of the Daily Telegraph, and I hope you will continue...