Jeremy Corbyn is campaigning to win the UK general election on Thursday 8th June. Today, he is specifically campaigning on his party's manifesto proposal to extend 30 hours a week of free childcare to all two-year-olds, including an appearance on BBC Radio 4 Woman's Hour. When quizzed about about the cost of this by Emma Barnett, he was unable to produce the figures, reaching out for his iPad, flicking through his manifesto and generally looking like a bumbling fool.

This PR blunder is easily avoided with the right preparation and interview briefing documents. Jeremy (and his team) should have considered his audience. They should have considered the topics that would be covered. They should have considered the questions that could have been asked - the good, the bad and the ugly. And they should have been prepared with the right figures in front of him. Putting a client in front of a journalist without covering these bases beforehand is like sending a lamb to the slaughter. Fail to prepare, prepare to fail.