It's certainly low mileage, most seem to be 60-80k miles, of course they are a few years old now.
Personally I'd be surprised if you couldn't get £6,500 or do for it with that history and low miles. However it's obvious from
Auto trader etc that no-one want's to buy these right now. Some seem to sit there for weeks or months.
The market is what it is, so in truth a car is only worth what someone will pay for it. If you have the time and patience to wait an indefinite amount of time I'd say put it up for what you want and wait til someone comes along who knows what it's worth.
I'd be tempted myself to swap, if I hadn't done so much to personalise mine already, not to mention the money I've spent on fixing it. Besides I'm quite attached to it now
Stick it on this forum's for sale board for now. At least anyone seeing it there can have a look and see your posts here, and see your not just any old person selling on a car they didn't care about.