A fellow birdwatcher pointed out what he identified as a Ruddy Shelduck, whilst looking for the Gt White Egret at Marlingford, Norfolk today.
However, it has a white head and a red bill. A hybrid perhaps?
On the other hand, after looking at http://www.gobirding.eu/Photos/EgyptianGoose.php the pale headed variants that are shown (swanton morley) look like what we saw.
Does anyone agree.