Forget those unofficial cannabis cards. You need a formal specialist...

https://mylesjnqb962.iamarrows.com/how-to-prepare-for-a-uk-medical-cannabis-appointment-as-an-expat

Forget those unofficial cannabis cards. You need a formal specialist prescription from a private clinic, as the NHS rarely provides this. Always gather your medical records first. Be very careful with local laws before you travel abroad with your medicine