Charnwood Water

Went to Charnwood Water to look at the water birds( there are always lots)and saw this little beauty basking in the sun....I have looked it up on line and think its a Gadwall...a female but I'm sure if I'm wrong someone will put me right.
Cos a duck is a duck to me they are all lovely.
GADWALL.
This very grey-coloured dabbling duck, a little smaller than the mallard, and with an obvious black rear end. It shows a white wing patch in flight. When seen close up the grey colour is made up of exquisitely fine barring and speckling. It nests in low numbers in the UK and is an Amber List species.