All-Day Birdwatch
Based on the sightings of the last couple of days I would guess that the following can reasonably be expected to be recorded on the All-Dayer:
Grey Heron, Cormorant, Little Grebe, GC Grebe, Mute Swan, Canada G, Shelduck, Mallard, Shoveler, Teal, Pochard, Tufted D, Coot, Moorhen, Water Rail, Pheasant, Buzzard, Peregrine, Sparrowhawk, Kestrel, Curlew, Lapwing, Green Sand, Common Sand, BH Gull, Herring Gull, LBB Gull, Wood Pigeon, Stock Dove, Feral Pigeon, GS Woodpecker, Green Woodpecker, Kingfisher, Swallow, House Martin, Sand Martin, Redstart, Blue Tit, Great Tit, LT Tit, Goldcrest, Spotted Fly Treecreeper, Reed W, Chiffchaff, Willow W, Lesser Whitethroat, Common Whitethroat, Blackcap, Pied Wag, Grey Wag, Meadow Pipit, Carrion Crow, Rook, Raven, Jackdaw, Jay, Magpie, Blackbird, Song Thrush, Starling, Robin, Dunnock, Wren, Chaffinch, Greenfinch, Bullfinch, Goldfinch, Linnet, Reed Bunting.
In addition to above 69 species there is also the chance of:
Little Owl, Sedge Warbler, Common Gull, Med Gull, Coal Tit, Hobby, Greylag Goose, Yellow Wagtail, Collared Dove, House Sparrow, Swift.
With many eyes on the sky there is also the outside possibility of:
Marsh Harrier, Red Kite, Osprey, a tern, a fly-over wader etc