In the UK, there isn't a fixed list of conditions for medical cannabis....

https://telegra.ph/Can-Sleep-Problems-Alone-Qualify-for-Medical-Cannabis-in-the-UK-A-Pragmatic-Guide-04-28

In the UK, there isn't a fixed list of conditions for medical cannabis. Instead, eligibility is determined by a specialist consultant. They look at your medical history to see if standard treatments have been tried and haven’t provided enough relief