I Believe that all the older vehicles were owned by a company that specialise in film rental,I know they also owned vehicles for Emmerdale like the Dingles van,last time I spoke to one of their drivers they were looking at selling of Edie's car which is now in private ownership along with Wesley's land rover, I am guessing that some of the modern cars like Barry's were loaned for the duration of filming each year,cheap advertising I suppose