Medical cannabis users must be careful. While a defence exists for the 2µg/L...

https://wiki-byte.win/index.php/Why_EVs_Feel_Different_to_Drive_if_You_Are_on_Medication

Medical cannabis users must be careful. While a defence exists for the 2µg/L THC limit, you must still meet DVLA fitness standards. Legality isn't a safety pass: if your prescription impairs you, don’t drive