Can I claim back annual leave if I've been ill, and do I have to hand over the original sick note? UK only.?

Do you mean the annual leave that you spent in Egypt? If that's the case then I wouldn't think you are entitled to this time back as annual leave for a later date this could open the flood gates for lots of people who suddenly become ill whilst on leave from work but if you mean any annual leave that you have remaining you are entitled to whether you have been present at work or off sick