Diamond Jubilee preparations

A general view of activity at St Katharine's docks as the first sailing boats are anchored in position downstream of Tower Bridge, ready to form the "Avenue of Sail", which the Queen's flotilla will pass through on the Diamond Jubilee River Pageant, on May 31, 2012, in London. Over a thousand vessels will form one of the largest flotillas ever assembled on the Thames.

Credit: Matthew Lloyd/Getty Images