Independent: Some will dress as clowns, others will wear masks, some will even be carrying their own environmentally friendly compost lavatories. But all are intent on bringing chaos to London. After days of speculation and intensive planning, central London is bracing itself for 48 hours of protests and chaos as thousands of demonstrators from a plethora of different causes descend upon the city for the start of the G20 meeting of world leaders. Anti-capitalists, social justice groups, …