Tufted duck female or immature?

Tufted duck female or immature?

Observation - Tufted duck female or immature? - UK and Ireland. Description: I think this is an adult female Tufted duck in winter plumage, or is it a juvenile? Looks a bit scaup like, but think there is a hint of a crest and it was a long way from the coast in Wiltshire. There were no other Tufted ducks around and I've never see

I think this is an adult female Tufted duck in winter plumage, or is it a juvenile? Looks a bit scaup like, but think there is a hint of a crest and it was a long way from the coast in Wiltshire. There were no other Tufted ducks around and I've never seen any on this lake before.