If these were Dunlin I would perhaps expect to see some remnants of the black belly and I can't see it on any of the birds.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
I agree with Chris, some of these these birds have all or part of their
summer plumage reddish brown underparts. Their upper parts are
also wrong for Dunlin, general pale/mid grey showing off darker coverts, plus the pale tail area all point to these waders being Knot.
Lat/Lng: 52.8, 0.4
OS grid ref: TF6431