it seems your not the first to say that there aren't many around in the condition that poeple want for the price they want to pay,
don't forget this was a £30k sports car when new, and your hoping to have saved £17k from buying it new 4 years ago. to be honest i think the car market is staberlising out, people are no longer panic selling like they were 12 months ago, people kno what they're worth, aren't in a rush to sell and are happy to hold out for the right price.
i think the bargain pick ups of last year are gone, and i think you may need to pay a more realistic price for the car.
i got my 06 11 months ago for £15,000 its only got 22,000 on the clock but i would proably ask about £14,500 - £15,000 for it now, but thats cos i don't want to sell.
if you want a bargain i think you'll need to be prepared to travel, i got mine in harrowgate, my last car in stoke on trent, and i live in suffolk. but then i saved £3000 on what a local dealership wanted for an identical car.