Depending on your usage patterns and tariff, you might want to give Intelligent Octopus a go. Same rates as Go, but you get an extra two hours for the house at 7.5p/kWh (2330-0530) and Octopus handles all the charging so you never spend more than 7.5p unless you need a bump charge.
It's been brilliant for my Dad, has never missed a charge, and he's been able to completely forget about charging at home provided he remembers to plug in his M3 overnight (the old chap is 84, so he's doing pretty well in my opinion). The vehicle charges to his percentage requirements set in the Octopus app by the time he sets every morning. I would do the same when the Y arrives, but I have a grandfathered Go tariff at a way low standing charge which I'd lose by switching to Intelligent.