This is a Dunlin, I believe it's probably a first winter juvenile but to be honest I can't be sure. Adult Dunlin in breeding plumage have a black belly patch which is unique amongst the small waders (which US birders call "peeps" by the way).  In the early Autumn when the birds start to arrive on our shores from their breeding grounds on the arctic tundra, adults may have the vestiges of their breeding plumage, but in "eclipse plumage" this  is  replaced by a more sombre and frankly, dull and more grey plumage. As the winter progresses they wear even more and the birds become more grey and even duller in appearance. At this time of the year they are much more photogenic.  Yoing birds are described to have brown heads when they arrive  on migration and have markings on the flanks so I guess that the bird in the photo above fits that description. It's not all that easy to get extremely close to Dunlin but it is possible (obviously) if you use a little bit of stealth.