This is the flag of County Durham
And here is a map for reference:
Here are a few videos about Beamish, and what is in it
And here are some photos of county Durham
And here is quite a humurous video where cyclists from the North-West of England cycle to Barnard Castle for an eye test in Specsavers, and Barnard Castle is of course in County Durham.
As always the transcript for the episode can be found here or on the transcripts section of the website.