Welcome to the Club, Paul. The s type is a great car to drive, but mainly what you need to check out is any underside rust in an a 1999 car. If it has a low mileage for its year and a good service history you should be OK. Others more mechanically expert than myself will be along to advise, as there are a lot of expert and helpful members in the Club. The low price will probably reflect both the year and the fuel usage. Regards, Peter.