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Although normally a tree, I've seen this kept down to shrub size by pruning. It appears that even council butchers can't kill it by random pruning.
Normally the seed pods would be a clear identifier, but if it has been pruned regularly then flowering may not have occurred, or flowering areas may have been removed.
How to take close-ups with cheap phone and hand-lens:
Field Guides for Budding Botanists:
... hmmm, I've looked at this again, Ambroise, *waves* and thanks for raising the point, I am now less than happy with my ID.
C. siliquastrum has leaves that are (usually) more "round" than this, but deeply cordate (heart-shaped) and with the red petioles (leaf stalks) that we see here.
C. canadensis does have a more "pointy" leaf. But not (normally) red petioles.
C. racemosa is out, as their leaves are rounded at the base, not cordate.
Looking at it again, the leaves seem too coarse and too deeply veined for either of the possible Cercis.
I guess we need to ask Tomdadom to go back and take more photos of it!
Having a second look i see what you mean!
....near Temple Lane, Surrey?
*leans back from rush of wind as iSpotters flee from their computers and converge on this shrub*
Lat/Lng: 51.15, -0.3
OS grid ref: TQ189403