There is a large tree, probably 30m metres + high on a neighbouring land. The ground slopes at around 45 degrees toward my house and the tree is around 10 metres from the house. If the tree were to fall in my direction it would likely cause significant damage. I noticed 2 years ago that the tree had developed a slight lean and there were vertical cracks appearing on opposing sides. I contacted the owners and they came and had a look. They sent a man with a chainsaw who promptly cut down a small 3 metre healthy looking tree and didn’t touch the problem tree. I’ve called the owners twice since to voice my concerns but they just tell me if they cut down the problem tree it will expose other trees which are more likely to fall. I checked the tree earlier this week and have noticed a new crack (last image) which goes from ground level to 2metres high, I can get a screwdriver 100mm into this crack. I called the owner and he’s just been to take a look. Again he tells me he can’t fell the problem tree as it will expose other trees to the wind. He then told me the tree was there before the house was buit so I've no right to complain. He did say he would get an expert out to take a look but after my previous experience of the owner I think this is very unlikely.
Is it possible to tell from the attached images if the tree would be classed as hazardous/dangerous, and what would be the best course of action?
