Very advantageous to buy in company name for tax purposes
Interesting that you describe is as "very advantageous". Apart from the opportunity it creates to invest the money short term, I'm not sure it is much/any? different at the end compared to how asset depreciation would otherwise handled in company accounts.
electricity not being seen as a fuel for “private use fuel” tax
(That's available to all employees, so not specifically a benefit of a company car.)
FWIW I struggle to charge more than about 50% at work. I have a relatively long commute (40 miles each way) so would have expected at-work charging to be significant proportion; I haven't analysed in detail, but weekend charging and days when I am on business trips and don't go via office must account for the other 50% at-home-charging - although doesn't feel like they are common - more common would be go to work, (charge) and then do a client visit locally ...
Either way, its 2p-3p a mile for Electricity so even at 30,000 miles a year its only £800-ish ... the £400 50% at work that I get for free, and no BiK, is not going to make a huge difference to me .... at least not compared to the £4,000 a year I'm now saving on Diesel!