In the UK, medical cannabis supply involves strict oversight by the MHRA to...

https://wiki-velo.win/index.php/Why_Are_Most_UK_Medical_Cannabis_Prescriptions_for_Unlicensed_Specials%3F

In the UK, medical cannabis supply involves strict oversight by the MHRA to ensure patient safety. Unlicensed specials must comply with Good Manufacturing Practice and Good Agricultural and Collection Practice standards