Since 2018, medical cannabis is legal in the UK via specialist private clinics....

https://raymondnngc161.tearosediner.net/navigating-private-medical-cannabis-clinics-a-guide-for-uk-runners

Since 2018, medical cannabis is legal in the UK via specialist private clinics. Eligibility requires specific conditions and failed prior treatments. If you are a competitive athlete, remember WADA strictly prohibits THC in-competition