Operators large and small, all over the UK, have buses of all ages coming and going in their fleets for many reasons, but very rarely solely due to the method of purchase/ownership.
I don't know much about how bus leases are drafted, so I am likely to be clueless here. But surely the method of ownership does have an impact?
On a traditional outright purchase the depreciation would be accounted for over 10 years or so, and at the end of that you've got a bus that costs you nothing to own but still has an asset value. This old bus goes on routes with lower patronage; the route can survive because it doesn't have to fund depreciation on a bus.
But on a lease, presumably the lease company will charge you the depreciation over the duration of the lease, plus a profit margin, and at the end of the lease you either buy the bus or hand it back. Not dissimilar to a PCP when buying a private vehicle.
If you buy it then you've then got to fund purchase and the additional depreciation
Although both amounts will naturally be lower, that's still something extra for alow margin route to have to pay for. So the temptation is, surely, to hand the buses back and get brand new ones on lease, just as you would with a PCP?
I think this is the point- Transdev have some really old kit they depreciated to zero a very long time ago, and they have brand new kit on lease. What they don't have is much stuff that's 10 years old and fully paid off. Maybe that's wrong?