Hi there - yes its possible - thats what i meant by visiting the Greek Embassy before you leave UK with your car, I understand that you must have owned the vehicle for more than 6 months have all the paperwork and then obtain papers from the embassy too. When you get to Greece you should visit the Customs authorities and they will advise you on the cost of transfering your car to Greek plates, however if the vehicle is more than five years old - there could be an extra cost as Greece is trying to resolve its pollutions problems and so a car that it over 5 years old is not considered to be environmentally friendly and attracts extra taxes as a consequence. Before anyone asks, there are no published figures for the amount of duty charged for importing used cars to Greece so i cannot tell you what the costs would be but maybe its just easier to buy a Greek one, that was my option and to date i dont regret it.