There are over 33 bridges spanning the river Thames over the 24 miles between Hampton Court Bridge in the west and Tower Bridge in the East. This is the Royal River - the one on which successive Kings and Queens of England, from Henry VIII onwards, have journeyed to their palaces. Some of today's bridges are the originals; others have been replaced up to four times. In the case of London Bridge there have been as many as 10 incarnations on the site where the current bridge now stands. Ian Pay tells the history, accompanied by Keith Waldergrave's excellent photography.