Thanks David, it is over that height and definately put up as "security", i.e. to stop us hopping across the wall to ask them to keep the sound down when they're blaring music.
Oirish, there's nothing more I'd like than to settle this over a cosy cuppa and a chocolate hobnob or three! The man makes Dubya look like a saint though, he refuses to talk to me except to give abuse and hangs up if I ring. If you want to check the events that led up to the of-fence-ive situation, I have a post here:
http://www.askaboutmoney.com/showthread.php?p=308825#post308825