We have a female duck here in NE Britain consorting with a male Shoveller]. Much smaller
Plumage wise seems okay for a not very well marked BWT. However the bill seems too large
Its head pattern seems too prominent and upper part hues seem to cold for CT but the bill looks good
Opinion here swings back & forward but our local Bird News Service have plumped for Cinnamon but I fail to se how they can be so sure. It doesn't look like any cinnamon I have ever seen