Medical cannabis has been legal in the UK since 2018 for chronic conditions...

https://www.novabookmarks.win/since-2018-medical-cannabis-has-been-legal-in-the-uk-many-runners-access-it

Medical cannabis has been legal in the UK since 2018 for chronic conditions when standard treatments fail. Runners can visit specialist private clinics for eligibility assessments. If you race, note that WADA prohibits THC in-competition