What was the journalistic scoop of the decade?

What was the greatest journalistic scoop of the past ten years?
Was it the uncovering of a series of systemic and systematic abuses at Abu Ghraib prison in Iraq?
The exposure of the CIA's secret rendition flights? Or the UK's MPs expenses scandal?
The BBC's Owen Bennett-Jones brings together a panel to dissect the decade's best examples of investigative journalism.

• Heather Brooke: freedom of information activist, and one of the key figures responsible for exposing the UK parliament's expenses scandal.

• Sumon K Chakrabarti: voted India's top investigative journalist in 2006.

• Nomsa Maseko: awarded South Africa's top journalism prize for her coverage of the 2008 race riots.

Owen begins by suggesting to Heather Brooke that her freedom of information campaign shows just how much information you can obtain through legal means.