It could be London plane. We have those locally but they're pruned by the council into bog brushes. The seedling was near a bird feeder so maybe it was a gift. It's probably academic now as I think I damaged the roots getting it out and much as I love them if left to grow naturally, I haven't the space😊 Thanks @Obelixx
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It's probably academic now as I think I damaged the roots getting it out and much as I love them if left to grow naturally, I haven't the space😊
Thanks @Obelixx
@Borderline
PS just had a Google. The leaves are very similar.