Commenting on the news that the National Crime Agency estimates there are tens of thousands of victims of human trafficking and modern slavery in the UK, former Liberal Democrat leader Tim Farron said:
"This shocking report shows that modern slavery is alive and well in 21st century Britain.
"It's a hidden national scandal.
"People are being bought and sold like cattle across the UK right under our noses.
"The government must step up efforts to stamp out this vile trade.
"Local police forces across the country need to be trained to spot the signs, and victims need to know that they'll be fully supported and protected if they come forward."