I just bought a 57 plate ST, 27000 miles on clock in the last month from a Vospers garage in the south west for £7000, it came with 6 month warranty, so maybe you do need to drop the price a little.... I traded in my astra VXR, that was mint only 24000 on clock and it dropped in value about £1200 from january to August... Maybe check the book price, as if you can get a similar motor from a trader then you will always buy form the trader as you get a warranty etc.... So a private car should be for sale for less than the traders...