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This bird looks much darker than any I have seen but the bird does look right for a Gadwall.
I think the entire picture is a stop or two under.
Yes i think they do look a bit darker on here than in my files. I will have a look at the RAW pics and see.
The RAW files had not been processed so they were a little dark. I have edited them and replaced them.
Lat/Lng: 52.9265, -1.0733
OS grid ref: SK623369