David Gadd is a professor of Criminology at the University of Manchester. He has produced a number of research papers on human trafficking and modern slavery.
And he argues that most sex workers don't consider themselves forced - and deserve a safe place to work.
“Sex work presents difficult challenges for the police and the criminal justice system,” he said.
“On the one hand, it is illegal to run brothels, live off the earnings of sex workers and to ‘force’ people into prostitution...
University of Manchester Criminology lecturer Dr Rose Broad says migrant brothel workers should not be marginalised.
“Migrant sex workers have additional vulnerabilities on the basis of their migration status, the inability, or perceived inability to access support services, language barriers and lack of knowledge of the law and social context,” she says.