Thinking of selling up...

[womble68]

Agreed when I sold my 1st car a Toyota Starlet I was paid £3300, where Parkers, etc. was talking £2500. I also sold my last car a Mk5 Golf GTI DSG based on prices on Autotrader as opposed to Parkers/WhatCar guides and managed it fine - really wierdly (because I hate it when ads say this) it was the 1st person that saw it that bought it - there and then - Bankers draft in town and off went the Golf!!
People define the value however they wish, if they see it is obviously not possible to buy the car for the "picked out of the air" guide price, then they'll pay the going price, which at the minute is anywhere between £3.5K and £5.5K, with the majority above £4K which kind of disagrees with your theory.