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Thank you for your replies.
This is too long and complicated to try to explain it all here.
I had to get the police to the man after suffering 18 months of him shouting abuse and threats at us through the party wall of his house and ours. (We still don't know why he did it).
During that time, I was having to knock on his door to ask him to trim back a climbing plant which he was growing up our extension side wall, and going under our tiles.
In October, it all came to a head, and I discovered he had screwed a trellis to our wall.
That was when I first informed him that I wanted the plant and trellis removing.
To which he replied that he would do so when I removed our TV aerial, as the birds were sitting on it and the droppings were damaging his roof.
I still can't decide if the man is mentally deranged, or if he is just a loud mouthed evil little man.
I thought it was rubbish regarding him ignoring the wrongly named letter. But, I just wanted to check to make sure.