Last Friday night, it came down. Today I cleared it up. Luckily the hedge hasn't sustained too much damage and the brash from the tree has been dead hedged.
The stem was severely decayed, brown rot galore! Lots of little Fistulina all over the piece that came down, with Inonotus dryadeus fruiting on the inside of the hollow trunk.
The lowest section of the stem, approximately 12ft long and 5ft wide at the bigger end, has been left in the woods adjacent to the tree for it's habitat value. Some of the larger wood will be milled in time, the remainder of the cord will be fire wood.
A sad series of events for me but at least the tree still stands.
It had been my intention to halo the smaller trees within the woodland so as to give a lateral a chance to get some growth on and leave plenty for the tree to retrench to. I've never before seen anything fruiting on this tree externally, though now I've been able to see inside and find the fruit bodies, I'm not so sure about that course of action! The lateral limb is probably getting on for a failure due to minimal attachment with a fair length and end weight, not to mention severe decay within.
Of the two remaining leaders, there is plenty of deadwood habitat, and little overextension/overweighting due to its own retrenchment process. It lacks however, much growth internally, so as it's bringing itself into a more compact size, it's seemingly running out of photosynthetic material, and hollowing as it is, much meristematic tissue.
So, courses of action to sustain this tree.....
Leave it and see
Retrench it with the intention of creating more internal, lower growth
Or the one from a rather enthusiastic Hatfield Forest veteran-tree worker "Get some sledgehammers up there, create some exposed cambium!"
Any thoughts?