I have a note of 75:
Mute Swan , Greylag Goose , Canada Goose , Shelduck , Gadwall , Teal , Mallard , Shoveler , Pochard , Tufted Duck , Common Scoter , Pheasant , Cormorant , Grey Heron , Little Egret , Little Grebe , Great Crested Grebe , Sparrowhawk , Buzzard , Kestrel , Water Rail , Moorhen , Coot , Avocet , Oystercatcher , Lapwing , Little Ringed Plover , Curlew , Black-headed Gull , Lesser Black-backed Gull , Herring Gull , Mediterranean Gull , Sandwich Tern , Feral Pigeon , Stock Dove , Woodpigeon , Collared Dove , Kingfisher , Green Woodpecker , Great Spotted Woodpecker , Magpie , Jay , Jackdaw , Rook , Carrion Crow , Wheatear , Goldcrest , Blue Tit , Great Tit , Skylark , Swallow , Sand Martin , House Martin , Long-tailed Tit , Cetti's Warbler, Chiffchaff , Reed Warbler , Willow Warbler , Blackcap , Sedge Warbler , Wren , Starling , Blackbird , Song Thrush , Mistle Thrush , Robin , Dunnock , Pied Wagtail , Meadow Pipit , Chaffinch , Bullfinch , Greenfinch , Linnet , Goldfinch , Reed Bunting
What else - Peregrine, Raven, Grey Wagtail, Treecreeper?