Medical cannabis is legal, but road safety rules apply. Keep under the 2µg/L...

https://www.bookmarkpage.win/prescribed-cannabis-is-legal-but-road-safety-rules-still-apply-you-must-stay

Medical cannabis is legal, but road safety rules apply. Keep under the 2µg/L THC limit and notify the DVLA. A medical defence isn't a free pass; you must be fit to drive. Legality doesn't replace responsibility—ensure you’re safe behind the wheel.