Any time you are serving food to the public in a restaurant or pub, you are required to have a hygiene certificate/health inspection. This is to show that all equipment, utensils, and food preparation areas are up to code, as well as that the food is properly handled and stored. You are also required to keep records of what you serve, as well as the temperatures at which it is served and stored at, and the dates and time it was stored, etc. While the certificates/inspections are time-consuming and require a lot of paperwork, they are designed to keep the workers, as well as the customers safe. Operating without a certificate/inspection will result in the restaurant or pub being shut down. This also applies to trucks, stands, etc. that serve food to the public.