UK drivers using medical cannabis should know that the ‘in charge’ rules apply...

https://isabellasbestperspectives.quillnesty.com/posts/can-i-be-in-charge-if-i-am-outside-the-car-but-holding-the-keys

UK drivers using medical cannabis should know that the ‘in charge’ rules apply even when parked and charging an electric vehicle. The legal THC limit is 2 micrograms per litre of blood