Navigating UK medical cannabis as an expat requires a specialist prescription,...

https://wiki-cafe.win/index.php/How_Does_a_UK_Prescription_Get_Filled_and_Delivered%3F_A_Professional_Guide

Navigating UK medical cannabis as an expat requires a specialist prescription, not a card. Private clinics lead the way, but you need your full medical records first. The NHS rarely covers this. Check travel rules carefully before you go anywhere.