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Green Sandpiper is a slimmer bird, compared to the chunky Grey Plover. It has a bill which appears almost twice as long and is far thinner, and the upperparts are very dark in comparison.
A good picture of Green Sandpiper for comparison was posted by CJT...
My Flickr photos...
Green Sand' is a shy wader which bobs it's rear end. Grey Plover (along with other species of Plover) has a step step wait movement. Quite a distinctive characteristic.
Please see my Flickr photo's www.flickr.com/photos/129804972@N07/
Thanks for the comments, not allways easy looking at a book
Lat/Lng: 51.089, -4.091
OS grid ref: SS536342