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

https://online-wiki.win/index.php/What_Does_%E2%80%98Cannabis-Based_Medicinal_Products%E2%80%99_Mean_in_Plain_English%3F

Since 2018, the UK has regulated medical cannabis as a prescription-only medicine, available through specialist doctors. Guidance from NICE supports evidence-based decisions to ensure patient safety and appropriate use