The BBC's Director-General Tony Hall has paid tribute to the former BBC Political Editor John Cole.
"Everybody wanted to know what John Cole thought about what was happening in the world of politics. He took us through an extraordinary period of the Thatcher government," he said.
"People loved him and wanted to hear what he had to say," he added.
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The Prime Minister has praised the former soldier's "huge professionalism" in trying to save the life of Pc Keith Palmer.
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