Littledave,
The AP is based on a few factors,
price of car
3 years monthly payments
Residual value
other (tyres,wins-d screen and insurance}
the AP or deposit is the difference. If yiu look at most lease schemes they work roughley the same
Electric cars currently cost more than ICE only cars due to battery costs, so the original price is higher
add to that, the residual value is all over the place, so the APs are set at a high rate