Corridors of Power - Westminster Abbey, London (S17E01)

In the premiere episode of the series, Tony Robinson, Professor Mick Aston, and the team delve into one of Britain's most iconic historical sites: Westminster Abbey. Amidst the bustling atmosphere of Parliament Square, they have just three days to locate a vanished sacristy, a fortification constructed by Henry III nearly 800 years ago, rumored to have contained the largest treasure trove in this region. As they excavate under the scrutiny of the Abbey's clergy and countless visitors, their efforts are persistently hampered by relentless London rain and layers of subsequent construction.