That would be my first guess as well, but I'm rubbish at plovers. These ones are quite plain, which even in non-breeding plumage makes a lot of the "ringy" plovers unlikely, and I get the impression that they're small (so lesser sand-plover rather than greater, perhaps) but I haven't a clue how to confirm that guess and I am not very optimistic that, even given this site's members' encyclopedic knowledge of things like primary projection or foot shape, such signs can be spotted in these photos.