Thank you Steve that's helped me a lot, trying to find this on the internet is a pain.
I relation to price, I'm steering clear of the 7 thousand high milers. I have my eye on one at the moment, £10,000 82k miles, but I'll be going to view it, it seems in the middle of the price ranges.
Min regards to test driving is there any noises that can give you a clue as to what's going? I.e. Whining gearbox, knocking suspension etc?