I bought a 2011 Mercedes-Benz C250 Bluefficiency Sport CDI Auto with 13,800 miles three weeks ago from a Mercedes dealer for £24,000, which I think is pretty much full retail. My initial feeling with the car was that it is a great drive, though maybe a bit too powerful for its own good, and that I had got a great car for about £9,000 below its new price. However, two items are not as the salesman described. The Command navigation system is not the latest version and only accepts the first five digits of a postcode, thereby requiring that I need a street name or full address to enable it to function.

Secondly, the advertised larger fuel tank capacity now also appears to be a 'mistake'. However, the biggest shock came this weekend when my V5 arrived showing that the previous owner was Avis Rent a Car Ltd. I had during the negotiations asked what the ownership history of the eight-month-old car with 13,800 on the clock was, to be told by the salesman that he thought it was an ex MB Milton Keynes car that had been serviced and prepared by them before being offered to the dealer network for resale. When I confronted the salesman on Saturday with this latest shock he tried to reassure me that cars previously owned by rental companies are recognised as the 'best checked and maintained in the industry' though accepting that I should have been made aware of the history.

Do you feel I have a fair complaint and do I have any grounds for asking for the car to be replaced with another vehicle of the same specification and value?