At Staines Reservoir there were 10 Arctic Terns flying around the north basin and occasionally they alighted on the water but always as a flock. Never particularly close I didn't get great views of them. The Slavonian Grebe was seen distantly and was now in summer plumage.
At Staines Moor I walked around the whole area twice with no sign of the Ring Ouzel or the reported Grasshopper Warbler. Best here was 3 Lesser Whitethroats, 2 of which I actually saw.