Family out car hunting, see nice 18 month old car at main dealers,20k miles, 12k pounds,dealer gives them detail sheet stating 1 owner.When asked can they see paperwork they are told Its the weekend,reg doc in another part of building.Any way they buy car, all ok, until reg doc comes back from swansea-3 previous owners.Can they reject car and get refund, or dealer has suggested a free service.What would you do?