5k does seem quite steep for the mileage.
Look at these two........
http://atsearch.autotrader.co.uk/www/cars_search.asp?modelexact=1&lid=search_used_cars_full&make=RENAULT&model=CLIO&variant=williams&keywords=&min_pr=75&max_pr=&mileage=5&agerange=&postcode=ls21+1nw&miles=1500&max_records=200&source=0&photo=1&sort=3&ukcarsearch_full=SEARCHhttp://atsearch.autotrader.co.uk/www/cars_search.asp?modelexact=1&lid=search_used_cars_full&make=RENAULT&model=CLIO&variant=williams&keywords=&min_pr=75&max_pr=&mileage=5&agerange=&postcode=ls21+1nw&miles=1500&max_records=200&source=0&photo=1&sort=3&ukcarsearch_full=SEARCH
One @ 60k
Two @ 49k