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

https://www.flushthefashion.com/health/from-counterculture-to-clinic-how-medical-cannabis-shed-its-image-in-the-uk/

Since 2018, the UK has regulated medical cannabis as a prescription-only medicine, available through specialist doctors. Treatment follows evidence-based guidance from NICE to ensure safe and appropriate use