I am with EDF on their "Go Electric 35" tariff ( seven days at 5 hours per night on the cheaper rate ).
Fixed until March 24 if I remember correctly ?.
It's almost 40p / kwh on the peak rate ( about the norm these days ) but only 4.5p/ kwh on the 5 hour off peak tariff.
We have tried to slide as much of our usage into that 5 hour window, that commences at mid night through to 5.00am.
We are now trying to use our previously long redundant emersion heater, to heat our hot water via a timer switch, as it is cheaper than heating water in our hot water cylinder via our gas boiler.
I almost switched to Octopus earlier in this year, but the EDF deal was very close due to it being fixed until 2024.