There is no government-issued medical cannabis card in the UK. Access requires...

https://wiki-cafe.win/index.php/Why_Do_Clinics_Care_So_Much_About_Verification_and_Identity_Checks%3F

There is no government-issued medical cannabis card in the UK. Access requires a specialist consultation and your medical records. If prescribed, you can opt for a private ID card to easily verify your lawful status, though this remains entirely optional.