Well, thanks to Phil Hemming’s comment, I was able to find the lake, but alas no Smew. All we could see were 2 Greylag Geese, 2 Canada Geese, 2 Coot, 6 Mallard, and a fly-over Grey Heron.
In the wood nearby we heard (then saw) a Willow Warbler; and then back on the Common proper we saw a wonderful display by a pair of Kestrel. Best only to look after the watershed! I missed a shot of a House Martin on the telegraph wires right next to me. You can’t win them all!