Since 2018, medical cannabis has been a legal option in the UK, provided it is...

https://remote-wiki.win/index.php/NHS_England_and_Medical_Cannabis:_Navigating_the_Rules_for_Sleep_Disorders

Since 2018, medical cannabis has been a legal option in the UK, provided it is managed under specialist oversight. It is never a first-line treatment and is only considered after other options have been tried