The British Sandwich Association (BSA) is to beef up its code of practice, turning it into a health and safety guide for bakers, foodservice and retail sandwich bar operators.
The first draft of the Food Standards Agency-backed scheme will be developed in January 2008 with a consultation period to follow.
The draft of a separate guide for sandwich manufacturers will also be available for consultation later this month, with a launch date scheduled for September 2008.
"There is great inconsistency in the way that enforcement is handled by environmental health officers," said BSA director Jim Winship. "Following a listeria outbreak at one site earlier this year, we found there was no protocol for reopening a factory once it had been shut down voluntarily. The intention of the guide is to address this."