So our CFN neighbours garden is in a "L" shape. The end of the L is the bottom of out garden. They have a workshop up against our wall which is great for privacy. On their border are 4 beautiful trees that are full of birds pretty much all the time.
Today he has been out there and chopped all 4 down. I mean they are his trees he can do what he wants with them, but it has made me really grrrr. We are losing so much wildlife and I try really hard to plant things to attract butterflies and birds. Now they have nowhere safe to sing at me in the summer. They used to be full of blue tits and sparrows and all sorts. Where are they going to go 
the trees were casting no shadows on his garden and were in no ones way.
Now I like this neighbour and family. They are good neighbours. They are his trees on his land. I dont have a huge garden and no room to put trees like this in. So he has done nothing wrong. Hes not really a Cf (unless you are a bird that used to sit in the trees).
However AIBU to want to plant a Californian redwood? I seem to recall that these grow very quickly.
Ok maybe not a redwood. I will let my buddleia get bigger this year and put some more big shrubs in. But still......