Many expats mistakenly seek a cannabis card. In the UK, you need a specialist...

https://wiki-mixer.win/index.php/Can_I_Transfer_My_Medical_Cannabis_Prescription_to_the_UK_from_Abroad%3F

Many expats mistakenly seek a cannabis card. In the UK, you need a specialist prescription, not a permit. Have your medical records ready for private clinic review, as the NHS rarely prescribes. Always research local laws before you travel.