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

https://star-wiki.win/index.php/Private_Clinic_vs._NHS_for_Medical_Cannabis_in_the_UK:_What_is_Realistic%3F

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