Help needed again!

I'm back again folks, many thanks confirming the Sedge Warbler. I spent the day at Martin Mere yesterday, to see the Pink Footed Geese, at least 30,000 there at the moment, great spectacle and lots of other stuff there to, see the pics on my blog site. But I took the photo below and was unsure at the time what it was, I believe it is a female Pintail, can any 'Duck experts' please clarify? Thanks  Gary