I've not got a charger yet, but will have the same problem (getting Octopus Go). What happens when you use the Mercedes-Me charging departure time option? Can you set it to be charged by a certain time say, 3am?Neither do I. Is this when you're plugged in to the wall box, 3 pin socket or neither?
The guy at the Mercedes Benz dealership sent me a video showing it was on his A250e in the showroom, so I'm wondering why mine doesn't.
Hopefully the BP Chargemaster allows you to schedule a charge?