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

https://averyssuperthoughts.theburnward.com/what-does-regulated-medicine-mean-in-real-life-for-cannabis-patients

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 guidance to support evidence-based prescribing decisions