Media playback is unsupported on your device

Police raids in crackdown on 'slum landlords'

31 August 2012 Last updated at 18:33 BST

Last February a BBC investigation discovered large numbers of people living in slum conditions in Britain.

Many of them were illegal immigrants sleeping in so-called 'sheds with beds' - illegal structures provided by unscrupulous landlords.

Ministers have launched a nationwide crackdown, vowing to tackle those who illegally house people in converted substandard outbuildings.

Chris Rogers reports.