No idea what is actually around but according to the book I have here... You could reasonably expect to see.
Common Waterbirds, Wildfowl & Woodland birds. Marsh Tit, Grey Wagtail, Treecreeper. I daresay they'll be getting some warblers soon and there'll be waders about. Apparently the target birds are Mandarin Duck, Cettis Warbler and Peregrine. Apparently Peregrine and Buzzard are seen daily.