Since 2018, medical cannabis has been legal in the UK for specific health...

https://wiki-net.win/index.php/Do_UK_Clinics_Prescribe_THC_Products_or_is_it_All_CBD%3F_An_Athlete%E2%80%99s_Guide

Since 2018, medical cannabis has been legal in the UK for specific health conditions. For runners managing chronic issues, access is provided through specialist private clinics