British prime minister David Cameron is to appear on one of the US's most influential TV shows to "bang the drum for Britain" and encourage Americans to visit or set up a business in the UK, Downing Street has revealed.
Mr Cameron is flying to New York to attend the United Nations General Assembly where he will deliver a keynote speech tomorrow.
Along with his packed schedule of diplomatic work, he will go into the studio to record an interview for the 'Late Show With David Letterman'.
Letterman has been a fixture on late-night TV in the US for 30 years, and draws a daily audience of three million or more.
US President Barack Obama has appeared on Letterman's show seven times.