Mystery male duck (well, I don't know what it is)

Mystery male duck (well, I don't know what it is)

Observation - Mystery male duck (well, I don't know what it is). Description: Saw this duck on the pond in Greenwich Park. Its beak is the shape of a Shoveler but the colour of a Shelduck. Its body colour reminds me of a Tufted Duck. What a mix! Can someone let me know what it is?

Saw this duck on the pond in Greenwich Park. Its beak is the shape of a Shoveler but the colour of a Shelduck. Its body colour reminds me of a Tufted Duck. What a mix! Can someone let me know what it is?