There is no government medical cannabis card in the UK. You must consult a...

https://blogfreely.net/gertonmhvf/what-happens-after-i-am-approved-for-medical-cannabis-in-the-uk

There is no government medical cannabis card in the UK. You must consult a specialist who reviews your medical records for a prescription. If prescribed, your use is lawful. Many carry an optional ID card as simple proof of their legal prescription.