Medical cannabis in the UK confuses many expats. You need a specialist...

https://yucatanmagazine.com/how-expats-in-the-uk-access-medical-cannabis-prescriptions/

Medical cannabis in the UK confuses many expats. You need a specialist prescription, not a card. Gather your medical records for private clinics, as the NHS rarely prescribes this. Always check local laws before you travel with your medication