Matt Chorley speaks to Times Radio's Chief Political Commentator Lucy Fisher, former Director of Downing Street Communications Sir Craig Oliver and David Herzsenhorn, Chief Brussels Correspondent at Politico and former Washington Correspondent at the New York Times. They explore the frequency of anonymous sources being referred to in the press and whether they can be useful or problematic.

PLUS Carol Lewis and Libby Purves on employing your spouse and trigger warnings.

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