Mystery tree/s

Mystery tree/s

Observation - Mystery tree/s - UK and Ireland. Description: This is a tree in my garden, nobody knows what it is! Seems to be half/2 kinds of willow! It has one trunk, then has a tangle of branches, some turn into 'weeping' branches with paler leaves and small greeny catkins, and some grow straight up with darke

This is a tree in my garden, nobody knows what it is! Seems to be half/2 kinds of willow! It has one trunk, then has a tangle of branches, some turn into 'weeping' branches with paler leaves and small greeny catkins, and some grow straight up with darker shiny leaves, a couple of months ago the straight up branches had white and yellow fuzzy catkins. Any ideas?