Gordon Brown has ordered a long-awaited inquiry into the Iraq war. But our security editor, Richard Norton-Taylor, says the secrecy of the inquiry means important questions may remain unanswered.
Diplomatic editor Julian Borger assesses the likely impact of an official investigation into the disputed election results in Iran.
Chief leader writer Julian Glover looks at the Guardian's latest ICM poll, which shows strong public support for electoral reform.
And Patrick Barkham explains how the large blue butterfly, declared extinct in the UK in 1979, was successfully reintroduced.
