White Bird with grey underparts

[peekaboo]

Can anyone help identify a bird I saw briefly last week? I first saw it flying, slightly undulating, and thought it might be a lesser spotted woodpecker as it had a lot of white on it and was about the size of a finch, perhaps a little larger. However, it came to ground for a few moments, and I could see it had a white back and head, with white on wings, and mid to light grey underparts. It may have had some black on wings and tail feather, but no bars like on the woodpecker. I cannot find any bird with so much white- could it be a juvenile...

[RobinP]

Pied or White Wagtail perhaps?

[Ollie]

The flght description as undulating and the colours sugest a Pied Wagtail to me as well. Welcome to WAB.
Roger

[RobinP]

Oops! How rude of me, welcome to WAB peekaboo.

[peekaboo]

Hi there and thank you for replying. It was definitely not a wagtail, I am very familiar with them and most of the common birds in Cambridgeshire. It's back and head were predominantly white, that was what was so remarkable about it. It was flying away from me when I first saw it and it's back and wings looked almost entirely white. I only saw its grey belly when it was on the ground for a few seconds. I thought I would try picking the brains of the forum because it is something I have not found in any pictures anywhere and am stumped!

[GME]

Could be an escaped domestic finch, such as a white or pied zebra finch?