Had a fantastic morning at Staines despite the midges..the three target birds gradually revealed themselves. First the scaup, which was very skittsh but ultimately distinguishable from the tufties. Then a small flock of little gulls started picking insects off the water surface, and finally two magnificent great northern divers showed really well as the mist lifted. The water was incredibly still, with no wind. Beautiful, even at the end of Heathrow runway...