RE: Off peak electricity usage
Of course, depends on mileage and family. But I'd say to people, if you do 6,000 miles/year and have more than one person in the house, I doubt it makes sense to use economy tariff. If you do lots more than 6k miles, and/or only live by yourself, it might work out.
I believe william already has/had overnight rates for his storage heating, so it is a no brainer then.
I thought we were profligate users of electricity! My family and I use around 20 to 25kWh daily, and my EV miles appear to add an average of 5kWh per day. The dishwasher and washing machine are usually running at some point overnight, but they would only use a couple of kWh so there is no real saving to be made there by going for an overnight tariff.
If this EV nonsense ever takes off, then of course there will be more electricity drawn at night and will no longer make sense for electricity companies to offer lower rates at night, because ALL times will then be peak rate!