Swan Upping is the annual census of the swan population on stretches of the Thames in the counties of Middlesex, Surrey, Buckinghamshire, Berkshire and Oxfordshire.
This historic ceremony dates from the twelfth century, when the Crown claimed ownership of all mute swans.
These photos were taken by our chairmen, Bob Hine, at the 2013 event. Click on an image to zoom it larger.
Visit the British Monarchy website for more information.