The Real Bread Campaign is planning to distribute stickers to consumers for placing on packs of plant bread, warning them against unlabelled processing aids used to make loaves. The labels will first be distributed at the Real Food Festival, at London’s Earl’s Court from 8-10 May, and will then be available to download.

The label reads: "Warning! This ’bread’ may be made using the following: amylase, hemicellulase, phospholipase, peptidase, xylanase, protease, oxidase and other enzymes, some of animal or GM origin. The law says bakers don’t need to declare them."

Organiser Chris Young of food pressure group Sustain said the campaign was calling for labelling of processing aids to be included on packaged breads. Currently processing aids are only required to be listed on labels for ingredients supplied into bakeries, following new EU legislation, effective from January 2010.

Young added: "Given the possibility of legal action being taken against anyone caught affixing them to anything they don’t own, we advise people not to stick them anywhere other than on wrappers of bread they have bought."

Federation of Bakers director Gordon Polson said: "Enzymes have recently been looked at very closely in Europe and it was found that they are destroyed in the baking process and are not active in the final product, so do not need to be labelled. The consumer gets much more labelling on packaged than on unpackaged bread."