Medical cannabis has been legal in the UK via private clinics since 2018....

https://star-wiki.win/index.php/Do_I_need_to_stop_driving_if_I_start_medical_cannabis_treatment%3F

Medical cannabis has been legal in the UK via private clinics since 2018. Eligibility depends on diagnosed conditions and prior treatment failures. If you are a competitive athlete, take care because WADA still bans THC in-competition. Always research.