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

https://wiki-mixer.win/index.php/What_Is_Shared_Care_for_Medical_Cannabis_and_Can_My_GP_Help_After_It_Starts%3F

In the UK, medical cannabis prescriptions start with a specialist assessment—usually through private clinics since NHS prescriptions are uncommon. If approved, medication is provided by regulated pharmacies to ensure safety and quality