A week after Morgan Tsvangirai was sworn in as the prime minister of Zimbabwe, Sir David Frost asks Heidi Holland, one of the last journalists to have interviewed Robert Mugabe and the author of 'Dinner with Mugabe', if the Zimbabwean president is really ready to share power. Plus, Alastair Crooke, a former British spy and mediator in the Middle East, talks about the 30th anniversary of Iran's revolution and his new book 'Resistance - The Essence of the Islamist Revolution'.