As the clock tower is dismantled into thousands of pieces and sent for repair, new technologies uncover astonishing secrets of the past. But will Ben's bells be ready in time to chime for New Year?
Anna Keay watches on as the multi-million pound restoration of a global icon begins
2017 Episode: Saving the World's Most Famous Clock
With the clock tower dismantled in pieces, will Ben's bells be ready to chime on New Year?
2018 Episode: Countdown to New Year