More recent data on food waste at manufacturing and retail was published by WRAP in May 2016, which can be found here
In 2012 WRAP undertook work to provide robust estimates of these flows in the UK grocery supply chain. The work was carried out by an internal project team within WRAP supported by Oakdene Hollins.
This report contains estimates for the amount of waste in the UK supply chain of food and drink. Estimates for 2011 are presented for food and drink manufacturing, retail and wholesale, including waste food and drink and waste packaging.
The report shows that grocery waste at the manufacturing and retail levels amounts to 6.5 Mt. Some 4.9 Mt arises in manufacturing and some 1.6 Mt arises in retailing. The waste comprises 4.3 Mt of food, 1.6 Mt of packaging and 0.5 Mt ‘other’ material.