Here's the result from mycarcheck. It confirms it's been in the same hands for 8 years and at least isn't a write-off. I guess for the condition the owner is asking too much money and has tried various outlets to sell it.
Crikey it must be rough and/or the owner must be very obstinate on price for it not to have sold. I can't say the condition would put me off IF the price was right but it looks like it isn't for it to have hung around that long.
Although it's got a current MOT it hasn't been taxed since Feb 2015 so presumably hasn't been used. I wonder how it's getting moved around the country to be offered for sale? In fairness if you look at the MOT history it's very clean compared with most Z3s.