It is Octopus yes, I was monitoring it using Teslamate, IO was waking the car once an hour for 15 minutes. When I informed Octopus about this they replied with…..
“
Like all charging, in order to Smart Charge your car, we will need to wake it up. We plan to back off and let your car go back to sleep (to avoid battery drain) as often as possible.
Currently, we only back off whilst the car is plugged in, as well as when the car is away from home and stationary. Try plugging in your car to send it back to sleep.
If your car is plugged in and it still won’t go to sleep, then this is unlikely to be caused by Intelligent Octopus is keeping it awake. It is likely that something else is causing your vehicle to stay awake.”
So I think it is best to disable smart charging once complete