Really enjoyed your presentation Terence. Our son James did one at EMFCamp about the Mayflower Autonomous Ship - See MAS400.com - he's on the People page under IBM Shipmates/IBM Research Crew. Anyway, to the point! We also use Octopus Energy for electricity and gas supply, and for more than 18 months now, we have been on the Octopus Go tariff for electricity, which costs about 14p/kWh between 04:30 and 00:30, but between 00:30 and 04:30, it's only 5p/kWh, so this is when we run the washing machine, dishwasher and charge the VW ID.3 - so to fill the 58kWh car battery overnight would cost £2.90 as opposed to £8.12 during the day. The Ohme charger app allows me to dictate when the car charges. Worth thinking about maybe? Cheers.