A Louis Levy postcard from about 1912 showing the new guard on its way to St. James's Palace from Wellington barracks for the Guard change escorted by at least four Police constables from Cannon Row police station.
<a href="https://en.wikipedia.org/wiki/L%C3%A9on_%26_L%C3%A9vy" class="extiw" title="w:Léon &amp; Lévy">Léon &amp; Lévy</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/31363949@N02/22796077316/">Buckingham Palace</a>