The
guide prices are a bit of a slap in the face but they are nowhere near as bad as what I was offered part-exchange! So in my situation, where I need to get a reasonable amount of money back for the car now, I'm a lot happier to give a private buyer the possibility of a decent bargain, rather than feeling I've been completely bent over by a dealer.
If my situation was different I'd definitely have held out at a much higher asking price and waited for the right buyer to turn up - which would be my advice to anyone who isn't desperate to sell now.
To be fair I'm just glad its only the car I'm selling and not my house, now that really would be a painful experience!
At the end of the day now is a pretty terrible time to be selling anything isn't it.
Thanks again for all the advice and comments.