Catering establishment: staff canteens qualify if they purvey food or requisites, regardless of public access. The expression catering establishment is to be understood by its ordinary dictionary meaning as an operation that purveys food and other requisites; it need not be open to the public. A canteen supplying food and requisites to students or members therefore qualifies as a catering establishment. The term is broader than 'eating house,' so an employee-only staff canteen may be treated as a catering establishment even if not an 'eating house.'