Survivors (1976) S02 E03 Lights Of London Part 1

Ruth has been duped into going to London, where a community of 500 is living. They need her because of her medical training, as many people are falling ill, owing to rats and a mysterious, deadly "London sickness". The group is led by a duplicitous, manipulative operations manager named Manny, and a physician who informs Ruth that only a group numbering 500 or more can survive; a smaller community would become extinct within several generations. This argument and the clear need for another doctor tempt Ruth to stay, and she enjoys the settlement's electricity and running water. Greg and Charles learn that Ruth has been taken to London and go to rescue her. On arrival they are attacked by a pack of rats. Original Broadcast Date 14th April 1976.