© Joel Goodman - 07973 332324 . 26/03/2011 . London , UK . A black bloc of protesters carrying black and red anarcho-syndiclist flags smash windows and graffiti a branch of HSBC in Cambridge Circus . Hundreds of thousands of people attending an anti cuts demonstration under the banner " March for the Alternative " in central London , in protest at the coalition government's austerity measures . Photo credit : Joel Goodman