Salix caprea 'Kilmarnock'..a male pussy willow tree that is weeping.
In UK it is planted as a tree outside.
Normally they are bought with a longer trunk.
There are many in this area planted by the builders.
They tend to be very top heavy and need support.
Please see my pics on flickr which show the local mature specimens.
https://www.flickr.com/search/...