Looking for some legal advice please regarding opening mail addressed to someone else. A little backstory - I've had problems with my 75 year old neighbour for a few years (he's frequently drunk, abusive and has put his fist in my daughter's face twice although not touched her). He put a note through my door this evening (one of many notes over the last 5 years or more) informing me that he refused to take a parcel in when I was at work today. That's fine, because I'd rather not have to converse with him anyway. However, I noticed on the back of the envelope that he wrote on, that it has the address of a specialist hospital that I'm being treated at for cancer. Our post person sometimes puts letters through the wrong door so it's quite possible that the letter he has opened (and written his note on the envelope) was actually addressed to me. I'm really really annoyed. He's pretty much admitted it to my mother with whom he communicates so I've little doubt that he's opened my mail. I've had to involve the police before due to his behaviour and I'm wondering what to do. Obviously I don't have solid proof of what was in the envelope (I'm going to ring the hospital tomorrow to see if they sent out a letter which I'm actually expecting) but I'm wondering what the next steps are if I want to take this further? Thanks.