Medicated cannabis users must understand: a prescription isn't a blanket legal...

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

Medicated cannabis users must understand: a prescription isn't a blanket legal shield. While a medical defence exists for the 2mcg/L limit, you must declare conditions to the DVLA. Legality doesn't override your duty: if you're impaired, don't drive.