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Have been comparing ID books for past Half hour trying to decide between them.
They are not always easy. This bird lacks any suggestion of an eye stripe, which you would expect in a whimbrel, and has no well-defined crown stripe, apparently. The head looks rather plain, compared to a Whimbrel's. The bill is also quite long and not as downcurved as you'd expect in a whimbrel.
My Flickr photos...
Lat/Lng: 52.8644, 0.446
OS grid ref: TF647324