Our scheme too is salary sacrifice, so you end up saving a shit load on NI and income tax. BIK currently is in the £10-20 pm bracket on the EV's on our scheme (which range from shitbox pointless Citroen whatever with less range than a Sinclair C5, to iPace/big Mercs and Beemers), although BIK is due to steadily increase going forward as the government are missing out on important income to waste on HS2 and other money pits.
The zero tax on EVs is also due to be phased out from next year - our scheme strangely doesn't include VED.
So our scheme covers everything during the length of the lease, except electricity, BIK, and road tax. Obviously if you abuse it enough to need wear and tear items like tyres too frequently, I think it's likely they might be miffed and charge. There is an excess on accidents, which I think is £250, but increases if you keep crashing.
This puts something like a Dual Motor Tesla around £500, excluding BIK and VED, which is potentially almost worthwhile (ignoring any views on Tesla cars) if I lived somewhere where I wouldn't have to frequently charge away from home - EV charging at public charge points makes petrol and diesel look dirt cheap. EV isn't yet for me.