Since 2018, medical cannabis has been legal in the UK through specialist...

https://johnathanrsnj030.lucialpiazzale.com/does-medical-cannabis-help-with-sleep-disruption-during-marathon-training

Since 2018, medical cannabis has been legal in the UK through specialist private clinics. Eligibility depends on your condition and previous treatments. If you race competitively, note that WADA prohibits THC in-competition