Medical cannabis has been legal in the UK since 2018, available through...

https://brooksiwjk610.wpsuo.com/how-is-insomnia-usually-treated-in-the-uk-before-cannabis-is-considered

Medical cannabis has been legal in the UK since 2018, available through specialist prescribing for specific conditions. For insomnia, it is typically considered only after other evidence-based treatments have been exhausted