Medical cannabis has been legal in the UK since 2018 for specific conditions....

https://iris-wiki.win/index.php/Why_Is_There_So_Much_Waiting_After_a_UK_Cannabis_Prescription_Is_Approved%3F

Medical cannabis has been legal in the UK since 2018 for specific conditions. Access requires a specialist assessment and proof that prior treatments failed to help. Most patients use private clinics for this process