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You can see on picture 2 that the tree is actually grafted. So it is potentially an unusual ornamental tree.
... that is an American species of Aesculus. (The red horse chestnut (Aesculus x carnea) inherits this spineless fruit character from the American parent, but the foliage doesn't look right for Aesculus x carnea.)
Lat/Lng: 52.3445, -2.2856
OS grid ref: SO806718