A report from War on Want last year found evidence that mainly women workers in Bangladesh regularly work 80 hours a week for 5p an hour in what it called "death trap" factories to produce garments for Primark, Tesco and Asda.

The Fashion Victims report was based on research at six Dhaka factories employing more than 5,000 workers.

The UK stores have all made commitments to pay a minimum £22 a month - calculated as a living wage in Bangladesh - but War on Want said wages started at £8 a month.

Last month Action Aid published a report showing workers at overseas suppliers of UK supermarkets being paid poverty wages.