GHP (Good Hygiene Practices) guides about the conditions of the products that should be produced under.

Proper Hygiene Requirements expressed as GHP, hygienic requirements is related to the design and configuration of hygienic food production facilities, cleaning and disinfection methods, food processing in raw foods are microbial quality, hygienic operation of each processing step, personnel hygiene is a system that includes applications such as. 

GHP Good Hygiene Practice is a complementary standard of GMP Good Manufacturing Practices.  Also this certification is defining Catering, Restaurant and Cafe applications for GCP Good Catering Practices standard supplements.