Depreciation percentages depend on the starting point. They are all based on the list price of the car. But some cars are heavily discounted from new. And other are heavily accessorised from new. Big discounts pull down their average residual percentages. And the fact that some cars are accessorised by as much as £30,000 pulls up their average residual percentage.

There's also a worry in the backs of people's minds about the cost of replacing the hybrid battery pack that can work out at around £2000, which is actually less than the effect on its depreciation.