Britain is bulging, we are now officially the fattest nation in Western Europe with one in four adults being overweight or obese. In a report for Tonight, Helen Skelton investigates our nation's expanding waistline and finds out how we can we eat ourselves healthy?We travel to Boston, Lincolnshire which is officially the UK's most obese town, to discover just how much the British public know about the foods we consume and how that might relate to exercise. Ever wondered how many minutes you'd have to skip for, to burn off that Doner Kebab? Tonight finds out.