Baikal Teal Sibirionetta formosa
This species was formerly placed in the genus Anas. It is a rare vagrant to western Europe but the situation is complicated by escapees from captivity. I've only seen one bird that was considered to be wild and that was too distant for photos, so here are some captive birds.
captive Baikal Teal, private collection at Wereham (Norfolk, UK), 5th May 2017
captive Baikal Teal, Martin Mere (Lancashire, UK), 26th December 2014
captive Baikal Teal, Pensthorpe (Norfolk, UK), 9th March 2014