I use Octopus Intelligent Go but then you need to spend c £1k on a charge point. I calculated that had an 18 month payback.
I tend to run the car down to between 20 & 40% so that the charge needed is large and then IGO decides to charge outside the 23:30 to 05:30 at the same tariif and thus I get 7p / unit electricity during a part of the day.
I also have pv panels & batteries. I charge the batteries at the 7p rate and on sunny weeks like this one I export power at 15p / unit.
