UK medical cannabis legality ends at the border. Rules across Europe vary...

https://highstylife.com/do-i-need-a-personal-export-licence-if-i-take-medical-cannabis-abroad/

UK medical cannabis legality ends at the border. Rules across Europe vary significantly, so verify local laws before you book. To stay compliant, always carry your original prescription, a current doctor’s letter, and keep medicine in original packaging