An investigation into a network of companies involved in VAT fraud within Leicester's garment manufacturing industry. After questions were raised in the summer about slave wages and unsafe working practices, File on 4 has now found a network of companies involved in a cash laundering scheme. Insiders say VAT fraud is endemic among garment suppliers within the city and there are concerns that millions in tax revenue are being lost each year. So how does it operate and why isn't more being done to prevent fraud within the fast-fashion supply chain? Reporters: Paul Kenyon and Ashni Lakhani Producer: Oliver Newlan Editor: Gail Champion