I wouldn't id Dave's bird as a Lesser, mostly because of the features mentioned by Dave himself. Because of the more squarish head, it also looks a lot less cute than a typical Lesser Sandplover (in contrast to the Virginia bird, which looks very cute in most of the photos). However, the bill shape isn't typical for GSP either (and like mentined, the stage of the moult fits better Lesser), so I'm not sure about the id.