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

https://blogfreely.net/gertonmhvf/h1-b-if-i-have-a-long-term-condition-how-do-specialists-decide-if-cannabis

In the UK, medical cannabis prescriptions start with a specialist assessment—usually through private clinics since NHS prescriptions are rare. If suitable, medications come from regulated pharmacies to ensure quality and safety