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

https://bizzmarkblog.com/what-does-it-mean-when-a-medicine-is-rescheduled-in-the-uk/

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) provides evidence-based guidance to support safe and appropriate use