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

https://lorenzoxyha610.huicopper.com/what-does-specialist-supervision-mean-for-medical-cannabis-in-the-uk

There is no official government medical cannabis card in the UK. Access starts with a specialist consultation and a review of your medical records to obtain a prescription. While not mandatory, some patients choose an optional card as proof of lawful use.