Prime Minister

But what do former prime ministers and presidents do with themselves once they've left office? How do they continue to make a mark? And what might Boris Johnson ...

It's hard for people to take the view that actually out of crisis you could find some opportunity to break the mould and get things done." The key, she says, is that as a former prime minister there is a big difference between Mr Brown and how other lobbyists or experts are received by people at the very top of government. And the people are overwhelmed by the scale of the challenges. "In the last few months what we've been doing in pushing this, is to make sure that we institutionalise the delivery system," he told the guests. Helen Clark, a former prime minister of New Zealand, has a simple answer to that one: "The first thing you do is take a long break," she says. "People want to have hope," she replied. Former Irish President Mary Robinson stood down early in order to take up a job as UN High Commissioner for Human Rights. Boris Johnson and Liz Truss are both only months out of office, and still MPs, so perhaps it's no surprise they haven't yet set off on a shiny new career. Close observers may detect an echo of his own premiership, in which a focus on delivery and establishment of a Delivery Unit were hallmarks. But it can also be a way of wielding influence - as she travelled the world, Margaret Thatcher's speeches always pressed the case for her reforms, her view of the world. So Mr Brown focused the question of funding education in low and middle income countries. "None of the major problems we have…