Si and Dave's historic pub tour takes them to London, where they discover inns that witnessed the Great Fire and pubs that watered the workers during the massive 50-year rebuild of the city. The Hairy Bikers start at a pub on the banks of the Thames where Samuel Pepys watched the fire sweep through the city. They also meet modern-day mud larkers who've uncovered fascinating finds in the muddy banks of the Thames - many of them linked to pub life in 1666.