Leading firms have teamed up with the Gangmasters and Labour Abuse Authority (GLAA) for the initiative.

The package includes a presentation for new starters which will be shown at the end of traditional health and safety inductions.

Other initiatives include complementary posters on spotting the signs of exploitation and a toolbox talk aimed at raising awareness of workers’ rights on site.

The move is part of the Construction Protocol launched by the GLAA and signatory firms to protect vulnerable workers, share information and raise awareness within supply chains.

GLAA Chief Executive Michael Rich said: “With more than 100 companies now signed up to the protocol, the industry is becoming increasingly aware of the problem of modern slavery and signatories are fully committed to playing their part in tackling this awful crime.

“By using these tools on site, workers will be able to understand their rights and know how to get help if they are being exploited.

“Ultimately, we want to work with the industry to create an environment hostile to all forms of labour exploitation.”

Mark Ramessa, Kier Group Commercial Director – Trades/Subcontracts, said: “Kier is committed to protecting the human rights of everybody working for, and on behalf of, Kier.

“We fully support the GLAA in raising awareness of the signs of modern slavery in the construction industry.”

Alice Hands, Strategic Procurement Manager at Sir Robert McAlpine, said: “The launch of this material helps to ensure that a powerful and consistent message is spread across our industry, making it clear that we do not tolerate unethical labour practices.”

Construction Protocol induction pack from GLAA on Vimeo.