Since Nov 2018, medical cannabis has been legal, but it’s not a first-line...

https://blast-wiki.win/index.php/Can_My_GP_Prescribe_Medical_Cannabis_in_the_UK%3F_A_Reality_Check

Since Nov 2018, medical cannabis has been legal, but it’s not a first-line treatment. You need a specialist prescription, typically only after other options haven't worked. NHS access is extremely limited, so many patients explore private clinics