This article explains how medical cannabis can be prescribed for certain...

https://wiki-wire.win/index.php/What_Does_%E2%80%9COne_Size_Fits_All%E2%80%9D_Not_Apply_to_Medical_Cannabis%3F

This article explains how medical cannabis can be prescribed for certain chronic conditions in the UK. It highlights that access is only through specialist doctors, with NHS prescriptions being uncommon