After a lot of pulling on ropes and checking levels, I managed to get the box up and secured. Rather annoyed with myself that I forgot to make the undercut on the branch that I had to cut back in order to provide a clear flight path to the box entrance. As you can see, even though I cut the branch away from the trunk, without the undercut it allowed the weight of the limb falling to rip into and damage the trunk! The tree is an Ash and is currently free of signs of Chalara [Ash dieback] disease.
