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Invisible PeopleEpisodes Episode guide
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Episode 5
5/5In the National Grid control room in Berkshire, staff predict surges in demand.
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Episode 4
4/5Telephone operators keep a 24-hour watch on elderly and vulnerable people.
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Episode 3
3/5Joe visits the Ordnance Survey's headquarters in Southampton.
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Episode 2
2/5Joe Kerr joins the control room of Group 4 Securicor's electronic tagging operation.
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Episode 1
1/5Joe joins the staff at Centrecomm, the control centre managing London's 8,000 buses.
