LONDON - The MI5 spy chief, who oversaw a safe Olympics and helped transform the Security Service’s counter-terrorism operations in the wake of the 2005 London bombings, will step down next month. Sir Jonathan Evans, appointed DG of the domestic intelligence service less than two years after the July 7 bombings, presided over an expansion anti-terrorism ops. There were no major attacks on his five-year watch. “He has experienced the service evolving over the years and as director general has led the service through particularly challenging times of change and unrest, including the aftermath of the 7/7 bombings,” said Theresa May.