London Tonight exposes the overcrowded properties that are homes to thousands of East London families.
Our special investigation comes as one London borough announces its plans to make it harder for people to get a council house.
This comes after the Olympics showed the world a London at its best. But in the shadow of the Olympic Park is a London most would want kept hidden. Families living in extreme poverty, living in the capital city in 21st century slums.
The London Fire Brigade has called on Londoners to report such slums because they are such a fire risk. But for most of the quarter of a million families living in overcrowded conditions, there is little choice.
For the second part in our series on poverty, Ria Chatterjee reports on the homes that are known simply as 'sheds with beds'.
If you've been watching this week you'll know we have shown a series of reports on poverty in London.
London may be one of the world's richest cities, but it is also one in which thousands of people live in poverty.