Could it be a lilac perhaps? difficult to tell from pics but the leaves look about right
Could you get a clearer pic of a branch to include the buds and how the leaves join the stem. From the leaves it looks more lonicera than philadelphus to me but I can't see anything in the pics of the shrub
Looks like a very leggy privet to me.
Maybe a coin in the photo of the buds to give an idea of size?
Viburnum tinus springs to mind