N80 - that was Autotrader and a little bit of patience (I'd been looking for over 2 months).
Book value (without extras) is about £4400-£5700 on 70k miles...
Since mine is 50k miles OVER the average, it pushed it right down towards the lower end of that, despite being in VERY good condition.
When I ran it through HPI, that returned a mileage adjusted value of £4400... but that is based on avg condition and no extras.... you get the condition and extras by either paying or waiting, normally just by waiting.....
Not sure which extras I'm missing.... sunroof, heated leather front and back, cruise control, Bluetooth prep and voice control for the satnav.
After that, it's just missing the S-Line body kit and alloys: currently has the "Sport" stuff....
Top tip: you can widen your search by including decent cars that have that naff plastic trim.... and then plump £100 or so getting it replaced.... I'm not sure, but I think the brushed Aluminum might be a bit more than that, but it's WELL worth it... you can see and feel the metal