Cameron to 'brush up' on history after Letterman show

David Cameron is in Brazil where he has opened a new factory near Sao Paulo operated by the Staffordshire-based manufacturer JCB.

While visiting the factory, the Prime Minister made light of his appearance on an American chat show last night in which he was unable to say what Magna Carta actually means.

James Landale has been travelling with the Prime Minister and watched the show go out.

Footage courtesy of Worldwide Pants