Since 2018, the UK has regulated medical cannabis as a prescription-only...

https://juliet-wiki.win/index.php/Is_Medical_Cannabis_in_the_UK_Mainly_About_Regulation_Rather_Than_Lifestyle_Now%3F

Since 2018, the UK has regulated medical cannabis as a prescription-only medicine available through specialist doctors. Guidance from NICE supports evidence-based prescribing to ensure patient safety and appropriate use