All the major supermarkets - Sainsbury's, Asda, Morrisons, the Co-operative, Waitrose and Tesco - have announced that they will use the label on their products, alongside Mars UK, Nestle UK, PepsiCo UK, Premier Foods and McCain Foods.
However, Coca-Cola and Cadbury have not signed up because they feel the use of guideline daily amounts is a better system, according to the BBC.
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Most of the UK will have a mixture of sunny spells and scattered showers before becoming drier in the afternoon.