A Jazz 1.4iES CVT-7 lists at £15,100 + metallic paint. That's about £1000 more than a year ago. What manufacturers are now doing when a new model is imminent (the new Jazz comes to the UK in 2015) is to raise the list price of the old one so they can claim minimal price rise for the new car. Then they discount the old car back to the sort of price it should have been anyway. I can't price your 2007 C70 without knowing which engine and drivetrain it has. Glass's trade book starts at £5350 for a 2.4SE manual, rising to £6330 for the SE Lux 2.0 diesel manual, all at 63,000 miles, so you may be getting a bit back that way. I think the ex-rentals at £12,995 make more sense than a new Jazz.