Prescribed cannabis is legal, but it’s a grey area on the road. Even with a...

https://www.bookmark-jungle.win/driving-with-medical-cannabis-needs-more-than-paperwork-while-a-medical

Prescribed cannabis is legal, but it’s a grey area on the road. Even with a prescription, exceeding the 2μg/L THC limit can be problematic. A medical defence exists, but you must still meet DVLA fitness to drive standards