"'guided inspections' of the poorest areas of London's East End"

The Slum Clearance Act (1930) set out a five-year plan for urban renewal and the building of social housing, legislation that was sorely needed given the squalid conditions in which many people were forced to live. Slums in the East End had repeatedly been condemned by health officers, but with no housing alternatives provided for the occupants until the Act was passed.

Further reading:

Inside the Skin of a Slum

Bethnal Green - Building and Social Conditions from 1915 to 1945

Social Conditions in Britain in the 1930s: Housing