You may wish to consider switching your energy supplier to an EV friendly policy.
Im currently with Octopus energy on their "go" tariff. They give 4 hours off peak charging at 5p per kWh.
I currently use the cars controls to program a charge timer to charge on the off peak hours. Although there are "smart" chargers which are able to sync with your smart meter and charge off peak etc, such as the ohme.