A small tree or a shrub. Deciduous, so leaf shape is unknown... Could you help IDing?
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I agree with Tim that this is definitely Euonymus however given that the photo was taken in London it could be the ornamental species Euonymus alata which is sometimes used in amenity plantings.
Thanks all for helping me. I think Euonymus alatus could be the one... I will keep an eye on it and see what it does in spring!
Lat/Lng: 51.516, -0.1749
OS grid ref: TQ267812