I regularly look to renew my cars and used to use ebay UK to aid my search, as I live in france but prefer to drive right hand drive cars as I visit my family in the UK quite often mit is not easy for me to simply pop on to a forecourt to view possible choices.
I have found that almost every advertisement for a private sale is a dealer, every statement of service history is a lie and almost every car has at least one accident in its history. When I report the most egregious cases to ebay they do nothing and deny any responsibility to investigate or check the frequent fraudulent users and they money lost to them. Caveat emptor has never been more applicable. Don't use the site or if you must check the MOT history via the government web site and do a full HPI check even though this is expensive if you are just looking.
Also watch out for the stolen user id's. Exellent feedback for selling anything other than cars or items below 10 pounds yet suddenly they are selling dozens of high priced cars.
I regularly find multiple instances of this and examples of phishing sites, so be very careful who and how you contact anyone. It is a great shame that ebay does not care to clean up this part of its on line empire, some of the other sections are excellent.