Twitter provided the info, @porthkillier the finder, and @randombirder cashing in on other people's hard work.
Straight onto Lockwood, and the three Common Scoter (one drake, two fem/imm), were located in with the large raft of Tufted Duck before swimming closer to the eastern edge. This represented one of my targets for London so was pleased to see this on the patch.
Also on site was a juvenile Northern Wheatear, three Common Sandpiper, two Swallow flew south, and a Kingfisher on Low Maynard.
A quick visit to the Waterworks and half a dozen Swift were still around the pitch and putt.