This has been growing in my garden the two or three years . Have been told byone garden centre that it is a willow or a weed . Still not really sure . Is it something worth keeping or should I just get rid ?

I don't think it is a willow, it is some type of tree, but can not tell which one.

If possible, can you get closer and take photos of the leaves, both the front and back of the leaves. Also, can you please get images of the main trunk/stem and something to show the leaf arrangement along the stem. Thanks.

It does look like it could be a willow. Hope someone can say for sure. It is pretty.

Yes Salix ..a willow...no doubt a gift from the birds.
Has the look of Salix caprea...common name Goat Willow.

https://www.naturespot.org.uk/...

It will grow huge.

These are the best pics i could get .