A crepuscular tour did not reveal anything much unfortunately.
A look at the Skibi Geo Arctic Terns was not very encouraging, about 40 pairs were on the colony but in 40 mins or so I only saw two very small fish brought in.
All sorts of excitement at The Shunan today, AL found a Wood Sand, which rapidly disappeared and then later in the morning a Pec Sand was reported, which I also could not find. However, two Common Sands, a Ringed Plover, 7 or 8 Dunlin, a Wheatear, and a redpoll sp flew through. In the garden a House Martin paid a brief visit.
Here's a couple more pix from Birsay, the Hoodies are nesting just by the Arctic Tern colony, so even if the sand eels do turn up I don't reckon much for the Arctics' chances.