Action is being taken by the government to ensure slavery does not take place in the supply chains of big businesses.

Home office minister Karen Bradley announced that large firms will have to publicly state each year what action they have taken to prevent slavery in their supply chains. The legislation will apply to all companies, regardless of their nature and what they supply.

The news came as a report by the Salvation Army revealed that the number of victims referred to them for support has risen by 62 per cent. In addition, the fact that labour exploitation is now more common than sexual exploitation underscores the need for action.

"Greater transparency will give customers, campaigners and shareholders the information they need to hold all big business to account while also supporting companies to do the right thing," said Ms Bradley, who is minister for modern slavery and organised crime.

A consultation has been launched to establish the exact threshold for the size of business to ensure the system is both fair and robust, while statutory guidance will set out the kinds of information that could facilitate compliance.