But these boundaries have been blurred at least since 1929, when Ramsay Macdonald put George Steward in Downing Street with orders to cultivate selected journalists and so counter the bias of the Tory press barons.
ECONOMIST: Bagehot
2.
Ross Ramsay was last seen at about midnight on 14 February leaving the Gala Casino on Sauchiehall Street.
BBC: Body of Ross Ramsay, 30, found in River Clyde, Glasgow
3.
Police have reviewed CCTV footage and discovered that Mr Ramsay headed west towards Charing Cross after leaving the casino and passed three people on Newton Street in the early hours of 15 February.
BBC: Mother makes plea over missing son Ross Ramsay