Michael Portillo takes to the tracks with a copy of George Bradshaw's Victorian Railway Guidebook. In a series of four epic journeys, he travels the length and breadth of the country to see how the railways changed us, and what of Bradshaw's Britain remains.His journey takes him from Buxton along one of the first railway routes south to the capital, London. This time, Michael explores one of the grandest railway stations and hotels in the country: St Pancras. He rides the world's first tube line to Smithfield market and climbs up the clock tower of the Houses of Parliament to hear Big Ben chime.