On the eve of President Trump’s unprecedented second state visit to Britain, Panorama looks at the state of the historic special relationship between the US and the UK.

Jane Corbin visits Scotland, home to the president’s golf courses and birthplace of his mother, and speaks to David Lammy, who was at the time of recording the foreign secretary, about the risks and rewards of dealing with Donald Trump, and assesses how the prime minister is handling his powerful and unpredictable guest.