I don't really know Peter, I guess a lot of it depends on how much charge you need to put into your car overnight.
AIUI, the EV tariffs give you cheap electricity overnight. The Octopus tariff for example gives cheap power only in a window from midnight to 04:00, so if you have say a 7KW charger this means you could bung in 28KWh in that time so enough for around 100 miles or so depending on how much you enjoy your performance.
I'm with Ecotricity, for ethical rather than financial reasons, and I'm on a single tariff of £0.36p, but at 4miles/KWh it's still significantly cheaper than the Land Rover which works out at about 25 p/mile and I'll still get a lot of free motoring in the summer.
In 2021 I consumed 5.29MWh overall. I generated 3.78MWh of which I was able to use 2.81MWH leaving .97MWh to go to export, which earned me nothing as I'm not on a FiT scheme and would in theory be available for EV charging. At 4 m/KWh that's in theory enough for 4,000 miles of motoring but of course I'll still not be able to use all of it. One interesting aspect is that of my 2.81MWh of home-produced consumption, over half of it (1.62MWh) came from my 7KWh battery, so it's clear that having a battery is excellent for increasing one's ability to use locally generated power.
Also interesting is that the new Lidl in Stroud has got a PodPoint charger which does 50KW charging at a cost (currently) of only £0.25/KWh, so it's cheaper for me to pop over to Lidl to get a charge rather than doing it at home when there's no spare solar power available. Downside is of course that I have to sit outside Lidl for half an hour while it charges.
