Prescribed cannabis is legal, but roadside reality is complex. You face a...

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

Prescribed cannabis is legal, but roadside reality is complex. You face a 2mcg/L THC limit. While a medical defence exists, it’s not immunity; you must notify the DVLA of your fitness to drive