Prescribed cannabis is legal, but driving is a minefield. Even with a medical...

https://www.generate-bookmark.win/ev-driving-with-medical-cannabis-being-legal-doesn-t-excuse-impairment-you

Prescribed cannabis is legal, but driving is a minefield. Even with a medical defence, the 2mcg/L THC limit stands, and you must satisfy DVLA fitness rules. Legality isn’t a blanket immunity—it is no substitute for your responsibility behind the wheel.