A lot of years ago there was a white Pigeon among a large flock, near where I lived. Lots of people saw it (it did stick out like a sore thumb among the others) and It stayed around all winter then disappeared. Going by size, shape and how it flew, it certainly seemed to be a Woodie, and definitely wasn't a feral or Dove.
aye and if they stick oot like a sore thumb they tend to become a target
by the way this flew and the size and shape of it i would of said it was a woody and could well be one if others have been seen before, ile be like a twitcher now when im next there im all for