Navigating medical cannabis as an expat in the UK requires a specialist...

https://lima-wiki.win/index.php/Can_I_Use_My_Home_Country%E2%80%99s_Cannabis_Oil_in_the_UK_While_I_Wait%3F

Navigating medical cannabis as an expat in the UK requires a specialist prescription, not a card. Private clinics handle this process differently than the NHS, so you must bring full medical records from home. Always check travel rules before you fly