Prescription cannabis doesn’t grant immunity from the 2mcg/L THC limit or DVLA...

https://www.list-bookmarks.win/navigating-medical-cannabis-while-driving-is-a-minefield-while-a-medical

Prescription cannabis doesn’t grant immunity from the 2mcg/L THC limit or DVLA standards. A medical defence exists, but it’s no safety pass. Legality doesn’t replace your duty to drive unimpaired