Since 2018, medical cannabis has been a legal treatment option for insomnia in...

https://station-wiki.win/index.php/Navigating_Medical_Cannabis_Information:_A_Patient-Centered_Approach_in_the_UK

Since 2018, medical cannabis has been a legal treatment option for insomnia in the UK, provided it is managed via regulated specialist prescribing. It is typically considered only after conventional therapies haven't yielded the desired results