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

https://wiki-triod.win/index.php/How_Do_I_Prepare_for_a_First_Conversation_About_Medical_Cannabis_in_the_UK%3F

Since 2018, the UK has regulated medical cannabis as a prescription-only medicine, available through specialist doctors. Treatment follows guidance rooted in evidence, including recommendations from NICE