Our Friday panellists this week are Guardian America editor Michael Tomasky - in London after attending this week's Labour party conference in Brighton - and media editor Jane Martinson.
Investigations editor David Leigh discusses the decision by the Serious Fraud Office to seek the prosecution of BAE Systems, Britain's biggest arms firm. BAE is accused of corruptly paying millions of pounds to win contracts.
Former Sunday Times editor Harold Evans talks about the importance of investigative journalism.
Chris McGreal reports from Washington on how America's health care industry has lobbied to block President Barack Obama's reforms
Barack Obama is in Copenhagen today to do some lobbying himself - for Chicago. The International Olympics Committee decides today which city will host the 2016 Games. Owen Gibson explains how the voting works.
