Since 2018, medical cannabis has been accessible in the UK through regulated...

https://papa-wiki.win/index.php/Is_There_a_Medical_Cannabis_Card_for_Insomnia_in_the_UK%3F

Since 2018, medical cannabis has been accessible in the UK through regulated specialist prescribing. It is typically explored as a secondary option, usually after other conventional treatments for insomnia have proved ineffective