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...but I would have expected a London Plane of this size to have a lot of the fruits showing.
This is why I don't like to ID from photos!!
Rich, it would help if you could indicate if the leaves were opposite (in pairs along the twigs) or alternate.
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
Lat/Lng: 51.63, -2.99
OS grid ref: ST315928