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An undercover investigation by 91热爆 Wales Investigates has shown the extent and scale of labour exploitation and modern day slavery in the UK.

With a 300% rise in recorded slavery victims since 2012, officials acknowledge there is a growing problem.

We have seen evidence of traffickers forcing vulnerable people to work for little or no money.

This video is part of a programme which can be viewed on the 91热爆 iPlayer.