Pink spike flower, growing in a building site, formerly a neglected garden.
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Details aren't always captured by photographs. What in particular do you think is not right?
Was there any foliage? The basal foliage of Persicaria bistorta is quite distinctive. (Like a dock leaf with winged petioles.)
Lat/Lng: 51.9558, -1.5378
OS grid ref: SP318286