Legal in the UK since 2018, medical cannabis requires a specialist prescription...

https://echo-wiki.win/index.php/Can_Cancer_Patients_Get_Medical_Cannabis_for_Nausea_in_the_UK%3F

Legal in the UK since 2018, medical cannabis requires a specialist prescription after other treatments have failed. Access is very restricted on the NHS, leading most patients to private routes. It’s vital to check your specific eligibility.