Hello, welcome to the website. My name isXXXXX can assist you with this.
You can prevent the tree trespassing into your airspace, i.e. over your fence and into your garden.
You can do this by either cutting the tree back yourself or seeking a court order requiring the landowner to do it.
You can only do either of these though if the tree is actually in encroaching into your land without your consent.
I will get it cut to his boundary What do i do with the branches or trunck
Generally, to avoid any suggestion of theft, you would hand them back to him, or at least give him the option of collecting them.
Do i have to inform him i am doing this. He will not answer the door or answer any letters
You can do yes.