The value of products bearing the Red Tractor food assurance mark rose £1.5bn to £7bn during 2007, according to new figures from Assured Food Standards, which runs the scheme.

New rules launched by Assured Food Standards, enabling products containing at least 65% Red Tractor-assured ingredients to bear the logo, led to the boost in uptake. For the first time products including breakfast cereals, flavoured milk and stuffed meat joints have been able to carry the Red Tractor logo.

The logo also appears on two thirds of all eligible fresh commodity foods sold through major retailers.

Some 74 food businesses are now in the scheme, with the logo appearing on both on retailers' own label ranges and major branded lines, such as Nestlé Shredded Wheat, McCain Chips and Bernard Matthews Turkey.

Many more brands wanted to come on board, said Assured Food Standards, with supermarkets also working to get the logo on more own label lines.

The scheme received a fillip last year when Dairy Crest launched a £1.5m ad campaign for its Country Life Butter, which prominently featured the Red Tractor.

"Demand is increasing from manufacturers, producers, food retailers and foodservice businesses, which indicates that they see the benefits the scheme offers," said an AFS spokeswoman. "The Red Tractor gives shoppers confidence about the strict standards of production it upholds."