Anyone know what kind of this tree is?

Can anyone tell me what this tree is called (not as in, Ella or Alfred, but its tree name).

In July I wandered round the Mytholm Works site and took several photos of it, so that I could identify its name from my tree book. But I didn’t manage to identify it. It has many trunks, if that’s any help.

Today I wandered across it again, without a camera, so I picked this leaf and photographed it at home.

 

Posted from Hebden Bridge, England, United Kingdom.

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