Efforts to tackle modern slavery in the UK, including the sexual exploitation of children, are in a state of crisis, a new report has claimed.
The Centre for Social Justice (CSJ) has attacked the Government for its "inadequate response" to the issue after an investigation by the independent think-tank uncovered a "shocking underworld" of human trafficking.
Its study found more than 1,000 adults and children were trafficked into or within the UK in 2011/2012, but the figure could be "only the tip of the iceberg".
Among the cases were British and foreign victims who had been forced into the sex trade, a life of crime or domestic labour.
British girls trafficked within Britain for the sex trade made up nearly one half of all UK slavery victims in the latest set of figures.
Christian Guy, managing director of the CSJ, said: "Our research has uncovered a shocking underworld in which children and adults, many of them UK citizens, have been forced into lives of utter degradation.
"Yet the authorities are either failing to understand the nature of this abuse or turning a blind eye to its existence. Our once great nation of abolitionists is a shameful shadow of its former self."
The think-tank is campaigning for a radical overhaul of measures to combat 21st century slavery, including bringing all human trafficking and modern slavery offences together.
It added that victims should be encouraged to come forward without the threat of facing prosecution over immigration breaches or crimes they have committed since being trafficked.
More training is also needed to ensure police officers, immigration officials and social workers recognise the scale and nature of the problem.