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It is a goat willow (Salix caprea) or grey willow (Salix cinerea).
...or a hybrid.
Because of the range of characters in those species, let me point you here and ask that you try to decide which it is for yourself - http://www.rfs.org.uk/learning/Willows
Please let us know what you decide.
(If in doubt, I would lean towards Salix caprea.)
Bear in mind that, as with all plants, individual leaves will vary - so you need to avoid being swayed by just one or two leaves/photos.