David Cameron will seek to work more closely with the Vietnamese government to combat human trafficking as he visits Vietnam...The diplomatic efforts come as the government prepares to step up efforts at home to end the modern slavery trade. A raft of new measures enshrined in the Modern Slavery Act will come into force on Friday...The government will also announce today that from October it will force companies with a turnover of £36 million or more to publish an annual slavery and human trafficking statement. This measure is the first of its kind anywhere in the world and will cover all large businesses who do business in the UK and have supply chains elsewhere in the world, for example South East Asia. In this statement a business must describe the steps they have taken to ensure that slavery and human trafficking is not taking place in any of their supply chains or their own business, or they must disclose that they have taken no such steps.