There’s no official government medical cannabis card in the UK. Access requires...

https://mighty-wiki.win/index.php/Can_I_Use_a_UK_Medical_Cannabis_Card_to_Travel_Internationally%3F_The_Truth_Explained

There’s no official government medical cannabis card in the UK. Access requires a specialist consultation and a valid prescription based on your records. Some clinics provide optional cards, which serve as handy proof of your legal prescription while out.