Medical cannabis became legal in the UK in 2018. Runners often access it...

https://yenkee-wiki.win/index.php/Navigating_THC_and_Anti-Doping:_A_Practical_Guide_for_UK_Runners

Medical cannabis became legal in the UK in 2018. Runners often access it through private clinics for conditions where conventional treatments have failed. Eligibility depends on your medical history