Huge crowds expected to attend Jubilee pageant
17 May 2012 Last updated at 19:29 BST
The Duke and Duchess of Cambridge will join the Queen on the Royal barge during the Thames pageant to celebrate her Diamond Jubilee.
More than a million people are expected to line the banks, bridges and parks along the river to see a flotilla of 1000 ships, boats and other vessels.
Philippa Thomas reports.