Are you using the Octopus app? I've tried it on 3 different occasions and it never lets the car go to sleep, so I end up losing huge amounts of battery because it just sits on the driveway, not sleeping.Octopus Intelligent beta. It's incredible, frankly. I will cry when it goes.
15.33p peak
5p off-peak, guaranteed 6 hours but also extra slots if Octopus schedules charges outside the 23:30-05:30 window.
I use the ev.energy app and it's flawless (but doesn't give the extra slots above the 6 hours).