British Royal Wedding Full Dress Rehearsal

London's Westminster Abbey from the air.

It's here that Britain's Prince William will wed Kate Middleton on Friday - in a ceremony steeped in royal tradition.              

And with less than a day to go - some of the key participants were gathering for a full rehearsal to make sure the big day goes without a glitch.

It's possible to see Prince William's younger brother Prince Harry arriving.  

And following him a stream of blonde-haired little girls who will be the royal bridesmaids...followed by page boys.

The bride and her family are not far behind, all aiming to make sure her three-and-a-half-minute walk down the aisle goes smoothly.

After putting the team through their paces, Prince Harry, Kate and her mother were spotted leaving the Abbey once more.              

Kate looked relaxed as she walked to a waiting car.

Her mother, Carol went to a separate one.

Outside the abbey and Buckingham Palace, the Queen's London residence, huge crowds were already building although there was still a day to go until the big event.      

At least there was something for them to watch as the traditional Changing of the Guard, involving the Household Cavalry took place.