The manufacturer of household brands, including Persil, Sure and Marmite, has also said it will publish the full range of plastic materials used in its packaging by 2020 to help create a "plastic protocol" for the industry.

This will form part of its renewed commitment to the Ellen MacArthur Foundation, a charity that promotes sustainable design, the firm said in a statement.

In addition, Unilever said it will invest in developing solutions to recycle multi-layered sachets — plastic pouches that are lined with other materials, often foil and aluminium — which it will share with the industry.

Last year Unilever announced 700 of its sites, including all of its European operations, were sending zero waste to landfill.

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