Medical cannabis has been legal in the UK since 2018 for specific conditions....

https://source-wiki.win/index.php/Does_Medical_Cannabis_Replace_Recovery_Fundamentals%3F_A_Guide_for_UK_Runners

Medical cannabis has been legal in the UK since 2018 for specific conditions. If you are struggling with chronic pain or injury, you might explore access through specialist private clinics. Eligibility depends on having already tried other treatments