As a comparison mate i just bought one today for £7.5k, 53,000 miles, 3 owners, full service history, all old mots, cam belt done at 44,000, all wheels recently refurbed, 4 good tyres, immaculate condition inside and out (few minor stone chips which is the norm on these) including steering wheel, 2 fobs, 2 keys, RS wallet and mats, MOT till June but no tax.
I would say the one you are looking at is a touch on the expensive side but then again he hasn't sold it yet and may get no where near £8.5k. Having said that it does look like a nice car.