In relation to sanitary conveniences to be provided in connection with houses and public and private places, the following provisions shall apply, that is to say: ¾

(1) Every house, and every public place and every private place shall be provided with not less than one sanitary convenience.

(2) In the case of any house, or public or private place in respect of which the requirements of more than twenty persons have to be provided for, there shall be additional sanitary conveniences in the proportion of one for every 20 persons, or portion of 20: Provided that this requirement shall not apply to public buildings under Part VI of the Health Act 1911, nor to licensed premises under the provisions of the Licensing Act 1911, nor to factories under the provisions of the Factories and Shops Act 1920.