There is no official UK government cannabis card. Access requires a specialist...

https://keeganseol681.lowescouponn.com/why-do-clinics-say-the-card-is-the-final-step-not-the-first

There is no official UK government cannabis card. Access requires a specialist consultation and a review of your medical records for a prescription. Once prescribed, an optional patient card serves as useful proof of your lawful treatment to others.