Have read advice from everywhere and have made a clean cut across 3 broken branches. I seem to remember reading that by inverting a clean empty tin (like baked beans) over the wound would protect the cut. Additionally I put a handful of horticultural fleece into the base of the tins to act as an insulator. Does this make sense? Would it help? Any branch that is not broken I am not touching with the hope that nature will come to the rescue. Trees are 20 years old and I love them.
It is best just to take off the withered leaves and leave the stems to sprout where they will. And let the sun and air get at them. Covering with a can could prevent sprouting at that point and could increase dampness and thereby lead to rotting. The fleece is of no benefit either.