The Hornbeam tree has been for dead many years, a fungus has been growing in/on it for a long time and chunks of bark have been falling off recently, only the ivy seemed to be holding it on so has become dangerous. As the landlord is having work done on the 1st floor, he will be landscaping the garden when the work is completed.
It is a shame to see any tree go, but what was left was a bit of an eye sore.