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

https://mill-wiki.win/index.php/Why_Did_Public_Sympathy_Matter_for_UK_Medical_Cannabis_Law_Changes%3F

Since 2018, the UK has regulated medical cannabis as a prescription-only medicine available through specialist doctors. The National Institute for Health and Care Excellence (NICE) offers evidence-based guidance to support safe prescribing