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

https://wiki-nest.win/index.php/Is_Medical_Cannabis_Actually_Legal_in_the_UK_or_Is_It_Still_Basically_Banned%3F_70809

In the UK, medical cannabis prescriptions begin with a specialist assessment—usually at a private clinic since NHS options are limited and rare. If prescribed, medicines come from regulated pharmacies ensuring quality and safety