They claim to have news that Abby is at a place called Derring farm where she and other members of a community are sick and need medical help.
Greg is suspicious, but after testing them it appears they do know Abby. Ruth goes off with the Londoners.
At Derring she discovers that the couple have tricked her. They actually want her to go to London with them and claim that she has no choice, as through contact with them, she is now contaminated with what they call the 'London sickness'.
Ruth is made to see she has no choice. London is smelly and infested with both rats and disease.
The journey to the Londoners' settlement at the Oval cricket ground is hazardous and dangerous.
They arrive at the settlement's headquarters and Ruth is introduced to their leader, who is called Manny. Ruth is very angry about her abduction. She is told that Abby had been in London the month before and had told them about the community at the Grange, from where they found Greg's directions to Whitecross.
She learns that London's 500 survivors survive on scavenging and have electricity, running water, telephones and radio. Ruth demands to know why she has been brought there. She is introduced to an elderly doctor who is running a hospital operation with the assistance of a nurse called Nessie.
She learns that about 1000 people survived the death in London, but that secondary disease has since halved that number and observes a case of 'London sickness'. The doctor fears that they will die out if the population level falls much below 500 and asks her to stay and help.
Ruth agrees and begins to enjoy some of the luxuries at the settlement, including a hot shower. The next morning she sees how the survivors have cultivating the Oval cricket ground.
Ruth begins to help the Doctor and Nessie with the sick and soon discovers that she has been brought to London to make up an advance party to prepare the way for a massive move to the Isle of Wight.
Ruth realises that there is not much chance of her ever returning to Whitecross. Meanwhile Greg arrives at Derring farm in search of Ruth and is given a map which he can use to get to the settlement in London.
He and Charles set off for London together. When they reach the Underground station they are attacked by some rats...
The Lights of London is clearly the showpiece of the second series, but for my money was transmitted too early in the running order to make the impact it deserved. For one thing it could have been used to break up the slower pace of the latter half of the season. As it is, this epic two parter comes hot on the heels of the destruction of the first community and the loss of Paul, making it somewhat indigestible and once again jarring.
Ruth is given centre stage and Celia Gregory makes...