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Bit worried with the other sheet it might have got people considering switching over purely for the cheapest overnight rate, which with some of them means a much higher day rate.
Google suggests that the average UK household uses between 8-10 kWh per day, so I've opted for 9 kWh per day. This will obviously vary based on how big your house is, or how much energy you generally use. The calc also includes the standing charge for the day on the household and household + charging figures.
Hopefully this is helpful, if you've got more suppliers that are worth adding (I've had a good look round, most of them aren't that EV friendly to be honest!) then please let me know. Similarly, if you've any feedback on this, let me know.
Sadly can't include Agile as I just wouldn't be able to keep up with it