There is no official government medical cannabis card in the UK. Access...

https://noon-wiki.win/index.php/How_to_Obtain_a_Summary_of_Your_Medical_History_for_a_Private_Clinic

There is no official government medical cannabis card in the UK. Access requires a specialist consultation and your medical records. If prescribed, you may carry an optional card as simple proof of your lawful, prescription-only status while you are out.