What price to swap Astra for sporty Fiesta? My son is looking to part-ex his 2007/57 Vauxhall Astra Sportshatch 1.7 CDTI SXI (27,000 miles, good condition, new MoT) for a 10,000-mile Ford Fiesta 1.6S, a three-door petrol model. Evans Halshaw is selling it for £9,864, including 17-inch alloys, full leather, sports body kit, rear spoiler, air-con, sports seats and tinted glass (some of which might be standard). What would be a good price to change? And if he sells privately, what should he ask? He's going to have to disclose all those Fiesta modifications to his insurer, which could hike the premium considerably. He should check that before committing. The Astra trades at £5,950, but he can ask a bit more as a private sale. You forgot to give the year and plate of the Fiesta, so I can't value it.