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

https://wiki-triod.win/index.php/What%E2%80%99s_the_Best_Way_to_Prepare_for_a_Medical_Cannabis_Eligibility_Assessment%3F

In the UK, medical cannabis prescriptions start with a specialist assessment usually at a private clinic, as NHS prescriptions are rare. If suitable, your medication comes from a regulated pharmacy to ensure safety and quality