The highlight was this Two-barred Greenish Warbler that was moving around very fast and not really offering much for the camera, but these shots show some of the key features...
Well-marked, broad double wing bar -
much stronger than on Arctic Warbler
Dark legs, markedly darker than the vast majority of Arctic W.
Lower mandible pale, with only a hint of a dark tip.
Annoyingly out of focus, but note strong wingbars
and the supercilium apparently bulging behind the eye.