Since 2018, the UK has regulated medical cannabis as a prescription-only...

https://fast-wiki.win/index.php/Why_Do_Some_People_Think_All_Cannabis_Is_the_Same_Thing%3F

Since 2018, the UK has regulated medical cannabis as a prescription-only medicine, available through specialist doctors. Guidance from the National Institute for Health and Care Excellence (NICE) supports evidence-based prescribing