@penumbra and
@ajm55555
guys, I would have thought you would have noticed the OP,
@Dogwood87 is in the UK. You should have started with suggesting maples native to the UK.
candidates would include
Acer campestre - the field maple - your leaves are close but not quite right, campestre tend to be slighty more rounded
Acer platanoides - the Norway maple - your leaves are a pretty good fit.
Acer pseudoplatanus - sycamore in UK and sycamore maple in USA. - your leaves seem to small and not quite rounded enough, but pretty close.
So best guess - Norway maple, but could be the other two.
Acer rubrum - a North American species widely introduced to UK and EU is close too, though I think Norway maple is best fit.
Note: break the leaf petiole. Norway maple, Acer platanoides will bleed milky white sap. All other species will bleed clear sap. The white sap confirms Norway maple.