SIR - Modern-day slavery and human trafficking are urgent challenges facing Britain, with several thousand people trapped in slavery now. According to the International Labour Organisation, modern slavery is an illicit trade worth at least $150 billion (£96 billion) per year that exploits 21 million people globally.

We are pleased that the Government has promised action and that the Modern Slavery Bill, currently before Parliament, includes a new requirement for businesses to report on slavery and forced labour in their supply chains. But this provision must be strengthened if it is to drive real change in company supply chains. That is why we are supporting a cross-party amendment to the Bill, which would make the law clearer on what information companies need to publish.

Kate Allen: Director, Amnesty International UK

Andrew Caplen: President, The Law Society of England and Wales

Steve Clifford: General Director, Evangelical Alliance

Marilyn Croser: Director, CORE coalition

Joanna Ewart-James: Director, Walk Free Partner Network

John Hilary: Executive Director, War on Want

Anne Lindsay: Lead Analyst on the Private Sector, CAFOD

Samantha Maher: Policy Director, Labour Behind the Label

Dr Aidan McQuade: Director, Anti-Slavery International

Paul Parker: Recording Clerk, Quakers in Britain

Caroline Robinson: Policy Director, Focus on Labour Exploitation (FLEX)

Kumar Swamy: Managing Trustee, Dalit Freedom Network UK

Jane Tate: Co-ordinator, Homeworkers Worldwide

Terry Tennens: Chief Executive, International Justice Mission UK

Steve Trent: Executive Director, Environmental Justice Foundation

Owen Tudor: Head of European Union and International Relations, TUC

Mags Vaughan: Chief Executive, Traidcraft

Andrew Wallis: CEO, Unseen

Ruth Chambers: Consultant, Transparency in Supply Chains Coalition