Documentary series. Documentary series. Engineer Rob Bell tells the story of the design and construction of six of Britain's most iconic bridges. For 17 years from 1981 to 1998, the Humber Bridge was the longest single-span suspension bridge in the world, and many consider it to be Britain's most beautiful. Rob Bell discovers the facts about its ground-breaking construction, why it took so long to build and how it changed the lives of the people of Hull and Grimsby.