Electric cars and tax

Not a discussion on the merits of electric v petrol / diesel please

My understanding is that my company could claim 100% of the purchase price of an electric car against tax, and as a director I would not be liable for any benefit in kind for using it.

Which sounds irresistible. (we live 7 miles away from the nearest city, which is our most frequent run)

Any financially-aware folks out there to point out the flaws in my understanding?

Thanks

Jon