Its nothing to do with any government scheme, but a personal arrangement between a loan company and possibly the vehicle owner. You had done the right decision by not purchasing, because these sort of things can come back to haunt you at a least unexpected time.
When the Ford Cortina MK5 was in production, I purchased one of these, that was 6 months old from a company "that was changing its fleet, for another make". Well satisfied with the vehicle, but just over two and a half years down the line, I received a visit from an investigator from a well known lease company. Apparently this vehicle including all the others on offer, plus a host of other equipment were all leased items, and not the sellers property (the company director's did a runner). In the end it all turned out fine for me ( I could have lost the vehicle and all the money that I had paid), because I re-purchased the vehicle from the lease company for a 'nominal amount' on paper that is!.