Can anyone ID this duck?

[u/Kisrah]

Sorry for poor quality photos on this one. It wouldn’t come close and was fast moving.

Mostly white/cream with a black head and black on back of wings. Was seen alone, but my mum had seen a pair further up river recently. Looks a bit smaller than our typical mallards.

This was spotted in Norwich, UK, but I can’t find a satisfactory match on native bird identifiers. Thinking it could be an escaped or dumped pet.

[u/SAI_Peregrinus]

Goosander, Mergus merganser.

[u/Kisrah → u/SAI_Peregrinus]

That’s it! The female lines up with the description mum gave me for the second one. So it’s the male I spotted. Thanks!