Since 2018, medical cannabis has been legally available in the UK via...

https://mag-wiki.win/index.php/The_Reality_of_Sleep_Maintenance:_Investigating_Medical_Cannabis_and_Night_Awakenings

Since 2018, medical cannabis has been legally available in the UK via specialist prescribing. Typically considered only after conventional sleep treatments have been exhausted, it is not a first-line option for insomnia