Actually octavius your wrong. You can own a car by leasing it, depending on the type of lease. A contract hire contract means that the vehicle will have to be returned at the end of the lease. Finance lease - you have the 2 options. Personal Lease you again have the options of keeping or getting rid of it.
As a fleet managers I see the benefits of both, but I would alkways Lease a car as apposed to getting a loan. Alot of the contracts allow you to take a maintenance contract out, which covers you for tyres, exhaust (fair wear and tear), serviving, tax etc etc.
If you want the vehicle to go through your business with the option of a peppercorn (lease extension) or owning the vehicle (paying the balloon) then I would go for a Finance Lease. Otherwise go for a PCP (personal contract purchase). Stay away from Arval, go with either LEX Vehicle Leasing or Leaseplan. Go through a broker too, they get you more dealer discounts as apposed to going direct. Trust me.