Thanks for the advice all. I'm a little reluctant to go down the eBay route due to the risk of it going for peanuts. I think the thing to address is how to make it visible to the type of person who'd be interested in buying it.
With that in mind I'm going to try and get it out to some of the places and groups the green(ish) minded people are likely to be, lots of environmentally conscious types in these parts, just need to find one with five grand. I've also emailed this Chris Ball guy (getaninsight.com) to see if he's interested, I'm guessing he's on this site a bit??
It's been quite a hard decision to make, but at the moment I don't really have cause to use a car on a regular basis and have found myself making silly journeys just to give the car a regular run.

I'll be sad to see it go though, but at least I've got that model one that I won at the meet in 2005 for being the biggest Insight spod.
I'll let you know how I get on.