In the UK, medical cannabis prescriptions begin with a specialist...

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 begin with a specialist assessment—usually at a private clinic, as NHS prescriptions are rare. If approved, medication is supplied through regulated pharmacies to ensure safety and quality