I guess winter isn't the best time for this but you could take a photo of the tree, find a branch with leaves attached (and any seeds/fruits) and ask for help with identification at a local garden centre - there'll be someone there horticulturally trained who should be happy to help. Some trees will be easier than others to identify e.g. Fruit trees and sycamore is a common one that's easy to identify and listed as safe.
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