Slight problem, we didn't know where we were going, deadly secret, and some were repeatedly left behind. They may or may not been able to catch up. Will ride leaders please bear this in mind next time.

The route taken was through Hyde Park and down Constitution Hill to the Mall and from there for a circuit of Parliament Square. Then along Whitehall and eventually making its way to the Angel and along Upper Street to the Shell Garage. The riders were greeted with a cheer and quickly merged with the partying.
More:

 http://london.indymedia.org.uk/articles/4808
 http://london.indymedia.org.uk/events/4683