Since 2018, medical cannabis has been a legal, specialist-prescribed treatment...

https://wiki-dale.win/index.php/Why_Do_Some_People_Describe_Cannabis_Sleep_Effects_as_Gradual%3F

Since 2018, medical cannabis has been a legal, specialist-prescribed treatment option in the UK. It is rarely a first-line therapy; clinicians typically explore this route only after conventional sleep treatments have been exhausted