Gyles Brandreth and Tina Daheley present live coverage of the world's largest unrehearsed parade. With over 7000 participants, the colourful three-mile long procession of pomp and pageantry brings together celebrities, charities, military bands and even an inflatable pig - all in honour of Dr Andrew Parmley, the 689th Lord Mayor of London. Commentary by Petroc Trelawny and JJ Chalmers.