There is no official UK government-issued medical cannabis card. Access begins...

https://www.herald-dispatch.com/sponsored/how-to-get-a-medical-cannabis-card-in-the-uk-step-by-step/article_a7f9fcb2-55db-40ff-857f-db6b98c92a97.html

There is no official UK government-issued medical cannabis card. Access begins with a consultation with a specialist doctor who reviews your medical records to assess eligibility for a private prescription