Since 2018, medical cannabis has been a legal, specialist-led option in the UK....

https://wiki-nest.win/index.php/What_are_realistic_expectations_for_cannabis_and_insomnia_in_the_UK%3F

Since 2018, medical cannabis has been a legal, specialist-led option in the UK. It is typically reserved for cases where other treatments have failed. As with any sleep intervention, results vary significantly between individuals