Unusual Bird: Unusual white bird

This is a white bird with dark wings and wing bars that looks a lot like a large, fat version of the goldfinch because it is white all over where the goldfinch is yellow. I have noticed it since August 2013 flashing about and have caught sight of it several times since. It is very difficult to photograph because it doesn’t come the feeders but I managed to get a somewhat distant shot of it on one occasion and it has been uploaded here. Thank you.