Went down again this afternoon, and saw several very mobile Yellow Wagtails - I estimated a dozen, but it could have been more!, 4 Black-tailed Godwits, 2 Snipe, 2 Little Egrets, and 2 large groups of small waders which flew south very fast through the marsh towards the estuary, I guess they were Dunlin, although a lone calling wader was a Ringed Plover.
I also bumped into a local man (non-birder) who described a bird he had seen on Tuesday, it seemed to me to be a very good description of a Bittern! Needless to say I didn't see it!
Did see a Tawny Owl being mobbed by a couple of Chaffinches in the reserve.