WeBS visit produced the following:
All reservoir: 43 G C Grebe, 27 Cormorant (8 nests now have young), 16 Grey Heron (Some young have fledged and nests are becoming empty), 7+3Y Canada Geese, 3 + 10 ducklings Mandarin, 26 Mallard, 3 Coot, 2 Stock Dove, 6 Swallow, 2 + 3 recently fledged young Pied Wagtail, 2 Song Thrush, 2 Garden Warbler, 3 Blackcap.
Dam end: 1 Mute Swan, 3 Common Sandpiper, 1 Green Woodpecker, 4 House Martin, 1 Grey Wagtail, 3 Whitethroat, 2 Chiffchaff, 1 Jay, 2+ Rook, 2 Goldfinch, 1 Reed Bunting. Also 2 Mink.
West End: 4 Greylag, 1 Red Kite, 2 Buzzard, 9 Common Tern @ rafts, 1 Kingfisher, 1 G S Woodpecker, also 2 Terrapins
Whillets: 1+ Reed Warbler heard, also 1 Fox. 1 Broad bodied Chaser Dragonfly.