In the UK, medical cannabis prescriptions start with a specialist assessment...

https://brooksssuperop-ed.tearosediner.net/is-medical-cannabis-actually-legal-in-the-uk-or-is-it-still-basically-banned-1

In the UK, medical cannabis prescriptions start with a specialist assessment usually at a private clinic, as NHS prescriptions are very rare. If approved, medicines come from regulated pharmacies to ensure safety and quality