I did part of it, marshal on a led ride from Sutton, then went round as far as Blackfriars. But just too frustrating with crowds of wobbly kids and even wobblier adults! Took a good 15 minutes just to get along the mall although did get better. But why oh why do people just stop in the middle of the crowd for a chat...get to the side of the road you muppets!!
Weather was really nice though