Legal since 2018, medical cannabis requires a specialist prescription, usually...

https://quebeck-wiki.win/index.php/Is_Neuropathic_Pain_a_Reason_for_Medical_Cannabis_in_the_UK%3F_A_Reality_Check

Legal since 2018, medical cannabis requires a specialist prescription, usually after other treatments fail. While available via the NHS, it is rarely prescribed, leading most patients to explore private care