UK medical cannabis prescriptions don't grant international travel rights....

https://page-wiki.win/index.php/Do_UK_Medical_Cannabis_Patients_Have_Different_Rules_Than_Recreational_Users_When_Travelling%3F

UK medical cannabis prescriptions don't grant international travel rights. Rules vary across Europe and local laws always take priority. Always pack original containers, your prescription, and a doctor’s letter. Check destination rules first.