Thanks for the table, Brydo. It illustrates my point brilliantly. The first in the list, British Gas, quotes a great price for off peak elecy at 4.7p. A shame they only provide this rate for 5 hrs which wouldn’t be enough to fully charge a low battery. The other 19 hrs you pay 20p, nearly 6p more per kWh than my current deal.
There’s no info there about daily standing charges or gas kWh charges. I would expect that there’s no savings to be made on any of them unless you’re doing at least 12,000 miles a year and even then, any savings will be minimal.
Maybe the situation would be better if you’re prepared to go against Fire Brigade advice and run washers, dryer and dishwashers overnight. That’s not something I would be comfortable with.