There is no official UK government medical cannabis card. Access is always...

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

There is no official UK government medical cannabis card. Access is always prescription-first via a specialist consultation and your medical records. You may purchase an optional private patient card solely as proof of your lawful prescription.