I'm with Octopus and have a 5 hour cheap slot 2130-0230. I set the onboard charge timer for this time every night so that if I need a charge I just plug it in when the wife gets home from work and let the charger do its stuff. This weekend the charge remaining was very low, I plugged the car in on Saturday afternoon and the next morning it had only got to 74% before shutting off (I guess the 'chameleon' charger really is as inefficient at 7kW as I have been reading). The car wasn't used on Sunday, so I just left it plugged in assuming it would finish the charge when the charge timer kicked in. Instead, we found this morning that the charge was still 74%. The only thing I can think is maybe you have to unplug and replug the cable to set the charge timer up again? This makes no sense to me, but I can't think why else it failed. Thoughts?