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....what makes you think it's sycamore? At this distance, it could just as easily be Norway Maple (Acer platanoides).
The overall shape of the tree, and size: could be either.
I'd want to see at least a close-up of a leaf before I'd be prepared to make an ID.
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Lat/Lng: 56.083, -3.467
OS grid ref: NT088887