I've just been checking autotrader for UK and there's a few on there ranging from 175k - 190k.

My main concern is the mileage on the current cars, the cheapest ones have like 7k+ miles, but there are some around 3k, and also a few around 1000.

Would I come across any kind of problems at all with high mileage or anything else?

Also are there some things I absolutely must know/do/don't before I buy?

And one last question is how to get insured for an under 25 year old, I'm not aware of any good private insurance companies.

Thanks very much!