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If you could show some of the buds it might be easier to id
Winter twigs can be difficult
Sorry I don't have buds as I saw the twig lying on the ground. Do you have any idea which type of birch it is? Not Silver Birch. Thank you.
...do you say "not silver birch"?
If you have a photo of the entire tree, that might help a little - especially the bark near the base of the trunk, where it meets the ground.
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Lat/Lng: 52.5331, -1.9501
OS grid ref: SP034928