Broadcast 19 August 2007, the fourth instalment is devoted to the 'backbone of England', the Pennines. The range runs for 268 miles from the Derbyshire Peak District to the Scottish borders, and in order to traverse it, Rhys Jones procures a Volkswagen Transporter. The Yorkshire three peaks comprise Whernside, Ingleborough and Pen-y-ghent, and it is the latter that Rhys Jones climbs in the company of a group of trainee soldiers. The highest point in the Pennines is Cross Fell, and the presenter visits it in inclement weather to find a stream, the River Tees, which provides water for the area. Rhys Jones surveys the River Derwent from the air and highlights its formative role in Britain's Industrial Revolution. He then views a limestone pavement at Malham Cove, whose cliff wall allows him to practise the art of yodelling, before descending into the Derbyshire caves – specifically Giant's Hole. The packhorse trails enabled the transport of goods but Rhys Jones' attempt at riding the Pennine Bridleway is not entirely successful. He visits England's highest pub as it plays host to a latter-day War of the Roses in the form of a ladies' darts match between Lancashire and Yorkshire. Following a trip to Sheffield to relate its industrial history, Rhys Jones accompanies a group of students to scale Stanage Edge. Finally, the presenter participates in a recreation of the mass trespass of Kinder Scout, which eventually led to the right to roam being enshrined in British law.