There is no government-issued medical cannabis card. Access is...

https://source-wiki.win/index.php/What_Details_Are_Usually_Printed_on_a_UK_Medical_Cannabis_Card%3F

There is no government-issued medical cannabis card. Access is prescription-first, requiring a specialist consultation and your medical records. While you can opt for an ID card as proof of lawful use, it is optional; your prescription is what counts.