Finding the left-handed thug in the short hi-vis vest who accompanied the dog-handlers and who fatally clubbed / pushed Newsagent Ian Tomlinson to his death shouldn't be hard. Story and video link HERE. Watch the slo-mo replay; you can see his baton hand raised in the club position, and as he throws Tomlinson to the ground he follows the blow through and raises his baton again at the end. He then speaks on his radio set in the background, and disappears to the group of officers off-camera to the right.
No wonder they've made illegal our taking of such footage and photographs. Now if Straw's Bill succeeds, they'll hold Tomlinson's Coroner's Inquest in secret, too.