No government medical cannabis card exists. You need a private prescription...

https://mylesjnqb962.iamarrows.com/why-is-the-uk-medical-cannabis-system-so-slow-a-behind-the-scenes-look

No government medical cannabis card exists. You need a private prescription after a specialist consultation and medical record review. You may carry an optional card as proof of lawful use, but your valid prescription is the essential legal document.