A police support officer guards a property in Pimlico in central London
A police support officer guards a property in Pimlico, in central London August 26, 2010. More test will be carried out on Thursday on the body of a man who worked for Britain's Secret Intelligence Service MI6 found at a flat near the agency's headquarters. The body of Gareth Williams was discovered by officers on Monday afternoon in the top foor flat in the upmarket Pimlico area of London. REUTERS/Luke MacGregor (BRITAIN - Tags: CRIME LAW POLITICS SOCIETY)