Since 2018, medical cannabis has been legal in the UK via specialist private...

https://romeo-wiki.win/index.php/The_Competitive_Runner%E2%80%99s_Guide_to_Medical_Cannabis:_Navigating_Legality_and_Anti-Doping

Since 2018, medical cannabis has been legal in the UK via specialist private clinics. Eligibility requires a diagnosed chronic condition and evidence that prior treatments failed