Tony goes behind the scenes at the iconic Cutty Sark in Greenwich, meeting with the passionate team who care for this historical tourist attraction. Later, Tony visits a metal recycling yard on the banks of the river, before heading out of London to the Hoo peninsula in Kent, where he discovers a rich history of military defence in one small fort.

The presenter watches a tunnelling machine being transported up the river into central London, and discovers plans to build a new tunnel under the Thames to take pressure off the crossing at Dartford. He also makes a late-night visit to New Covent Garden Market, and meets a Paralympian in training at Marlow Rowing Club.

In this episode, Tony travels as far as the Estuary in the East and Waterhay in the West.