Presumably most of the charging done at home? It seems to be when you're reliant on premium (fast) public chargers that the costs add up. At home you can take advantage of things like the Octopus EV tariff and pay 10p/kWh overnight for EV charging.
I don't have an EV.. but my driving pattern would put me at 99% home charging. Basically I'd never need to use a public charger other than 4-5 road trips a year.