Thrats of physical violence should be reported to the police so that there is a formal record.
If the climbers cut on your side of the property line they may have been doing it to make a proper cut instead of stubbing. Not a good idea when there is the level of acrimony involved.
As for calling "your lawer" this is not the advice we gave. You need one who is familliar with property rights, trespass, and specific tree issues. Your council may be able to point you in the right direction. You may be up against pressident though. Trying to set new president can be an uphill battle. I do think it is something needs to be done?
City hall may be biased in your neughbors favor and see it as a property rights issue where he is in the right. Who knows.
Have a surveyor assess the true property line so that you have verification. Here's the ASCA link again
http://ASCA-consultants.org/.
BTW where did I "say anything about being nieghborly? I just reread my post and it's not there.
What I was asking is do you have to allow them on to work on the retaining wall.
BTW what you want to look at is loss of amenity value and cost of cure. Is the tree a total loss? have yuo lost any screening it provided? Will the work done cause risk of future falure?
He cannot allow workers onto your property. They ,and the company they work for are responsible, for their actions such as tresspass.
And again, document, document, document.