If you normally lease a car, and are a high or top rate tax payer its worth it, particularly if it can push you into a lower band for say, pension tax or loss of personal allowance.
The deals don't seem amazing though so if you are a basic rate payer, shop around.
If you earn £100,000 - £125,140 then it can help you get back some personal allowance
If you are above that it can reduce your 45% tax rate.
If you earn £200,000, then it can help reduce tax on pension.
But you have to balance that with the fact that EVs are cheap second hand