UK EV drivers using medical cannabis should be aware of the ‘in charge’ rules....

https://wiki-wire.win/index.php/Is_It_Risky_to_Dose_During_a_Motorway_Services_Charging_Stop%3F

UK EV drivers using medical cannabis should be aware of the ‘in charge’ rules. Even while parked and charging, the 2 micrograms per litre THC limit applies