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No definitely not Olive.
I have worked in the house next to this tree for four years I have never seen the fruit before but I have never been so close, if the fruit stays that size, that would explain why I have never noticed the fruit before.
At the moment im going with the "weeping pear" the tree does get incredibly dense for a pear though, and if it is a pear I wouldn't be able to grow from a cutting I dont believe.
I will google and see what else I can come up with, many thanks, I will let you know what I find.