As said its all about the right person at the right time. I decided last Saturday to sell my Astra van,I didn't really want to sell but it was just getting in the way so I put a very basic half hearted ad on gum tree with no picture at a cheeky price (half hoping it wouldn't sell). Sold the van on Wednesday for 50 quid under the cheeky asking price.
On the flip side,I've been trying to sell the wife's fiesta for 4 months at a very good price and just can't budge it! It's just the luck of the draw really