At Broadstones today I came across two ducks which I wasn't quite comfortable with identifying.  Initially I thought they were female Mallards but closer inspection revealed a longer-than-expected bill and no blue patch on the side.  I managed to get a pic of one of the ducks, although the length of the bill isn't entirely clear owing to the angle.  I started thinking female Shoveler, but wasn't sure that the bill was long enough.

I'd be grateful for any help with this.

Many thanks David.  I guess male Mallard in eclipse with slightly longer-than-normal bill makes good sense.