Cannabis is legal for some, but the 2mcg/L THC limit is non-negotiable. A...

https://dlf-ne.org/can-i-drive-in-the-uk-if-i-have-a-medical-cannabis-prescription-the-reality-behind-the-wheel/

Cannabis is legal for some, but the 2mcg/L THC limit is non-negotiable. A medical defence helps in court, but it doesn't replace DVLA fitness-to-drive rules. Being legal isn't the same as being safe; you’re still responsible for your impairment levels.