Medical cannabis offers a statutory defence for the 2mcg/L THC limit, but it's...

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

Medical cannabis offers a statutory defence for the 2mcg/L THC limit, but it's not a free pass. DVLA fitness-to-drive rules still apply. Legality doesn't replace responsibility; if you’re impaired, you’re liable. Avoid the insurance headache.