Nightrider / Cycle London at night

Thinking about doing this: http://england.shelter.org.uk/what_you_can_do/events_and_challenges/night_time_london_cycle_ride

and wondering if anyone else is, or if anyone did the first one last year? What was it like? Did they close any roads or was it normal traffic? Many riders?

normal traffic between 11pm and breakfast is significantly down on normal traffic. i doubt the roads are closed but will be fairly calm