British companies are to be forced to publish evidence on their websites that their operations are not reliant on international slavery, under legislation aimed at exposing details of supply chains to public scrutiny...Under the new rules, which come into force on Thursday, large UK-based firms will release information showing they are taking steps to ensure none of the businesses with which they trade use slave labour...About 17,000 UK businesses will have to publish these statements before the end of their financial year. Officials hope organisations campaigning against modern slavery will monitor the statements and name companies that are not taking any action.