In a ground-breaking social experiment for the BBC's Crossing Divides series, 5 Live invited 40 people to break out of their bubble and have a face-to-face conversation with a person whose views were fundamentally different to their own. Did they find common ground? The results might surprise you… (Pictured: Matthew advises police on knife crime. Support worker Lindsay describes herself as a 'fat activist'. On the day, they discussed whether obese people should pay more tax to fund the NHS).