GCHQ boss: Secret does not mean sinister

Some work that GCHQ carries our is "necessarily secret," Sir Iain Lobban said.

"I don't think secret means unaccountable in any sense."

"I don't think secret means sinister," he added.

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Snowden leaks 'operations risk'

MI6 chief Sir John Sawers said the leaks from NSA whistleblower Edward Snowden "have been damaging and put operations at risk." The heads of Britain's intelligence agencies were questioned by MPs in public for the first time.