How does the role of the environmental health practitioner (EPH) play a part in protecting the health of the public?”

This essay should describe and discuss the various ways in which the role is (EHP) has a positive impact on protecting the health of the public. Should explore and include all of the different areas of environmental health; Food safety, Health and Safety, Housing, Evironmental Protection and Public Health. Please use British English and use books not the web. Thanks. Please no American english.