Legal medical cannabis isn’t a free pass. While a medical defence covers the...

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

Legal medical cannabis isn’t a free pass. While a medical defence covers the 2mcg/L THC limit, you must still be unimpaired and notify the DVLA of your condition. Legality doesn’t replace your responsibility to drive safely. Always put safety first.