A friend of mine said he has just switched to Economy 7 with Octopus. The night rate is cheaper than the 14.51p on the Octopus Flux tariff I'm on and is for a longer period (7 hours rather than 3 on Flux). I have a battery so a large majority of my import is off-peak and it...
options are storage heater - instead of electricity it keeps heat through the day, switch to some novelty tarrif like Agile from Octopus, you get various rates through the day 10-16 tends to be cheaper, but then 16-19 much more expensive. There are new players like Tomatoe Energy...