Whilst walking through a graveyard in London today i spotted a strange bird which was definitely not a native. Unfortunately I did not take a picture but I can describe it fairly well. It was similar though not identical in size and shape to a blackbird. It had an orange beak again similar to that of a blackbird but it's feathers were white with some black streaks toward the rear of the body. It was hopping between the floor and gravestones searching for food. Does anyone have any idea as to what it was?