Medical cannabis is legal, but driving remains a minefield. With a 2μg/L THC...

https://evpowered.co.uk/feature/medical-cannabis-and-uk-driving-laws-what-ev-owners-must-know/

Medical cannabis is legal, but driving remains a minefield. With a 2μg/L THC limit, a prescription offers a potential medical defence, yet it doesn’t bypass DVLA fitness-to-drive requirements