It is 40 years since amateur archaeologists dug up Roman remains near Ermine Street, now hidden beneath Cheshunt Park. Time Team tell the story of the original excavation, using the detailed plan to conduct their own investigation. They believe the site's proximity to the road is the key to this dig. With some brilliant work by Stewart and John, they soon locate part of the road. Though frustratingly they cannot find any trace of it beneath the surface, they do find a brewery and possibly a pub. The brewing process is described by ancient technology expert Peter J. Reynolds. They conduct a mini-experiment comparing Roman surveying techniques with Henry's modern equipment. They are also joined by Roman experts Rosalind Niblett and Harvey Sheldon.
