Critical Mass has no leaders and no one is entitled to make any announcement on its behalf. If there ever is any, the correct response to such an announcement would be for people to ignore it and make up their own minds.
We loved the London Critical Mass ride. It’s definitely one for every cyclists calendar!
We left from Waterloo and went around the city. It was great!
If you want a better report, posts yours to firstname.lastname@example.org or to the list http://lists.riseup.net/www/info/cm-london