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they look like female turnstones...
I think the issue here is that you have uploaded images of 2 species. The first image shows 2 Turnstones, while the other images are of a different species and from your last image I would say they were Dunlin.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
I am not sure which field guide you are using, but Baird's Sandpiper is an American species. It turns up over here every year in very small numbers, usually as individuals in different places. Occasionally, a West coast location, perhaps in Ireland, gets a couple together, but to have a flock like this would be quite incredible!
A flock of small waders like this in this country should make you think of Dunlin, Knot, Sanderling, Ringed Plover.
My Flickr photos...
Thanks to everyone for their kind help and useful comments. I'm sure that the first photo is different, now that I look at it more closely, and I agree that it's more likely to be the turnstone, with the others being dunlin.
I'm posting a last picture separately which shows the birds in flight, and at the back is one which is different from the others - this may reinforce the turnstone id (if it's not something else entirely, that is!)
PS It seems superfluous to say that birds aren't my specialism, but they aren't.
Lat/Lng: 57.66285, -3.61458
OS grid ref: NJ037648