Medical cannabis users must stay alert. While a medical defence exists for the...

https://wiki-velo.win/index.php/Can_I_Drive_My_EV_the_Same_Day_I_Start_Prescribed_Cannabis%3F_The_Reality_of_Roadside_Law

Medical cannabis users must stay alert. While a medical defence exists for the 2mcg/L THC limit, you must notify the DVLA of your status. Being legal doesn't bypass fitness-to-drive rules