i know mileage of cars don't matter much these days if serviced right, but it's the value i think about (and probably too much, probably doesn't help me being an accountant lol), anyway:
how many miles do you do in a year?
if say average of 12k a year.
a 57 estimate sept 07 register, it is now 1.5years old (ish) and so if it was average mileage car should be around 18k miles.
42k miles divide 12k average miles = equate to a 3.5 yr old car
if you did average miles for say 2 years, so ad an extra 24k miles. so will be a 3.5 year old car, it's going to have 66k miles.
this averages around near 19k mile/yr car. only thing for a car like this is people want low mileage.
depending on your budget, you can get similar spec for a couple more £k with average miles.
i had the option to buy a member car a 2005 gti with about 20k miles on it. only thing it required a big service, cambelt, waterpump, service, dsg service, new tyres etc. and so adding things up it was going to be an extra £1k to be spend soon ontop.
when are cambelts supposed to be changed? i would look to get it changed at the 50k mile mark, so something else to factor in.