Medical cannabis has been legal in the UK since 2018 under specialist...

https://astrodud.io/medical-cannabis-for-sleep-disorders-what-uk-patients-experience/

Medical cannabis has been legal in the UK since 2018 under specialist oversight. It is not a first-line treatment and results vary by patient. For some, it helps with winding down or fewer night wake-ups. Always consult a specialist to see if it suits you