The Co-operative Group is the latest retailer to give its backing to the FSA with plans to put controversial traffic-light labelling on the front of its packs.

The company's stance is important for the FSA, as the alternative to traffic lights - Guideline Daily Amounts - has been building up a following.

Morrisons announced last month that it intended to put GDAs on packs, joining Tesco and a swelling number of manufacturers.

However, the FSA's traffic lights could at last be reaching a critical mass with the society's announcement, joining Sainsbury, Waitrose and Asda, which have already pledged their allegiance to the FSA scheme.

A spokeswoman for the society said the labelling would be supplemented on back of pack with GDAs of key nutrients. The priority areas for roll out will be core categories of pre-packed processed foods, which will start to hit shelves with the new labels from September.