The big three have each agreed partnerships with High Street brands which they say the public recognise and - crucially - trust.

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The past month has seen several failures of High Street brands, including furniture chain Habitat, department store TJ Hughes, fashion chain Jane Norman and Moben-owner Homeform.

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Tessel Pauli, a spokeswoman for the Amsterdam-based Clean Clothes Campaign, said activists at the scene had identified labels from European and US high-street brands.

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