Medical cannabis is legal, but driving isn't a free pass. You must stay under...

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

Medical cannabis is legal, but driving isn't a free pass. You must stay under the 2μg/L THC limit and meet DVLA fitness-to-drive standards. A medical defence exists, but legality doesn't replace responsibility