By Matthew Young A forensic review into the death of “body in the bag” MI6 spy Gareth Williams found he was likely alone when he died. The 31-year-old’s naked body was found in a North Face bag in August 2010 with enduring theories including he was the victim of a Russian hitman, a hostile foreign intelligence agency or had been involved in a sex game that went wrong. Scotland Yard officers ordered new laboratory tests to be carried out on key items found at the scene of his death in the government-owned flat in Pimlico, central London, half a mile from MI6’s headquarters. Modern forensic tech…