United Biscuits is celebrating another success in its bid to cut waste by eliminating landfill from four of its factories, reported the grocer.

The Jacob's and Twiglets maker said its UK sites in Hayes, Consett, Rotherham and Ashby were no longer sending non-food waste to landfill. That comes after the company last year eliminated food waste being sent to landfill from its 14 UK facilities.

"We'll continue to work hard to ensure more of our sites achieve this until we meet our target of zero waste to landfill by 2012," said UK managing director Mark Thorpe.

"We'll continue to increase recycling, reduce the amount of waste we bring in to sites, and as a last resort, incinerate waste to create energy. But we'll also look to reduce the amount of waste we generate internally and work with our suppliers to identify ways they can help us achieve our target."

Last year United was put up for sale by its private equity owner Blackstone but a buyer has yet to be found