I could lie but I wouldn't really feel comfortable doing that as there's a bit of a back story....
He went through a phase of stomping around the landing in the middle of the night int his pants screaming that he was going to kill someone named 'Jenkins'. Obviously this was a bit unsettling so the police had attended a couple of times (not called by me). His behaviour was becoming more erratic (he cracked the glass in the landing door by punching it) so I eventually wrote to the landlord as this was beginning to freak my girlfriend out.
It turned out the guy has seizures that cause him to become aggressive and disorientated and this is what caused these incidents, which was fine as he's not in control of what he's doing. I now have a contact number for his sister and occasionally have to phone her or an ambulance if he's having one of these seizures.
But the thing that annoyed me is that when the landlord spoke to him he denied the police had ever been in attendance and that he damaged the window, basically calling me a liar, so again this is why I'm inclined to go straight to the landlord.
None of this actually bothered me that much until one of the wee flies landed in my glass of red wine the other week....