One bird amongst many Tufted ducks and Pochards on freshwater lake. Seemed to be getting very friendly with a pochard!
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Your bird does look good for a male Scaup based on the features visible in the photo - I wouldn't want to rule out the possibility of a hybrid from this single photo, but it seems that a drake Scaup did spent a while at Chorltn Water Park recently!
Lat/Lng: 53.421676624218, -2.2669338584274
OS grid ref: SJ823916
Small dipping pond off the main lake