From here:
Wednesday 7 September
7.30-8.00pm BBC ONE
Ep 5/5

Broadcast live from Wrexham, Dan Snow and Sian Williams present the final programme in the series. The team are at Erddig Hall, a stately home, where they explore the extraordinary relationship that existed between the servants and masters of the house.

Unable to conceal the servants due to the thin structure of the house, the masters instead embraced them, celebrating their lives in elaborate portraiture which remains on display to this day.

Once again, a team of reporters and the nation’s favourite celebrities reveal some of the country’s most mysterious, surprising and compelling stories. Tonight, Sheila Hancock explores the changing role of female spies post-Second World War and forensic anthropologist

From here:

In the final episode of the series, Dan Snow and Sian Williams broadcast live from Erddig House in North Wales, where they get a glimpse of what life was really like for Victorian servants.

Special guest Sheila Hancock looks at the changing face of the female spy, whilst Michael Douglas meets the extraordinary World War II veteran whose torpedoes sank the Bismarck.