[abrugsch]

There are multiple electricity providers in the UK currently that have "EV tariffs" where they give you substantially discounted overnight/off-peak rates in exchange for a slightly higher daytime rate in order to encourage overnight charging. Often up to a maximum specified number of KWh per cycle.

In previous times they used to offer a tariff called economy 7 which worked in conjunction with so-called storage heaters. They would charge during off-peak times and provide heat during more active hours. (disclaimer, I've never lived in a property on such a scheme but definitely saw a few in my student days)