To me this looks like a miniature lilac but a shrub not a tree, I'm sure someone will put me right on it ! Its flower buds look just like lilac but tiny. I don't think it has been pruned in years so I will get rid of all those dead bits as soon as it stops raining!
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Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
Syringa patula (Palib.) Nakai 'Miss Kim'.....Sorry I do not have pics
The leaves are a different shape...not so round..pointy.
https://www.google.com/search?q=Syringa+patula+(Palib.)+Nakai+'Miss+Kim'&rlz=1C1CHBF_enGB785GB785&sxsrf=APwXEdcSFwB5ccO8xD_k-DHPPvH6llzzgg:1680162293969&source=lnms&tbm=isch&sa=X&ved=2ahUKEwidrcmllIP-AhUJQ8AKHcWTAR8Q_AUoAXoECAEQAw&biw=1280&bih=577&dpr=1.5#imgrc=WPhJiX0lgm_vOM