Many thanks for that.
This tree was said to be an establishment tree from when the first part of the building was built, probably around 1770. As a result of this, it has been a point of discussion for many years following the initial diagnosis of Phytophra(sp), some 8 or 9 years ago when it shed a very large limb.
I have worked on it a couple of times since, attempting to reduce sail and weight from its massive canopy, in the hope of making it "safer" due to its location.
This seems to have worked up until now, as it never dropped any further limbs. Due to the extent of the disease, the constant monitoring of it finally lead to the decision to make safe by this extensive reduction. The other alternative was to fell, and was suggested by the local TO's initially, but the client has already lost a very large amount of its nearby mature habitat due to age and many to flooding, so the decision was made to retain and hopefully promote it as a live monolyth or veteran.
Only time will tell how successful this will be, but the client is well aware of the risks, both of losing the tree, and future maintenance.
One thing that became very evident whilst removing the limbs, was the extent of the disease. At a guess, 80-90% of the scaffold limbs had lateral cracks in them, some still showing in the photos. May not be totally seen as a positive thing, but was reassuring to know we had made the right decision, in fact, it was amazing catastrophic failure had not occurred on any of them.
Many of the staff are now aware, as you say it would be nice if a better understanding can be put forward in general, but in reality is often difficult.
As for spiking, I dare say the same respect would have been given to a none protected tree, unless it was on the "spec" to do so with the intension of causing bursts.