If you are not allready with them check out the "octopus go" tariff. Is just about to drop to 6.5p/kWh overnight(12:30-4:30 I think?). You need an EV to be on the tariff but the whole house use is at te cheap rate overnight.
We charge our house battery on the cheap rate and us that during the day. We very rarely end up using full price leccy. They do a refferal scheme as well.
Thanks, we are indeed already with Octopus and have the Intelligent Octopus Go tariff. It's great! When we had the previous EV it cost about £5 for 300 miles of range, which at current fuel prices is like... 20x cheaper than diesel.
If we were going to stay in this house for 10+ years I'd be very tempted by a solar setup as well.





