This work presents the specific liturgical variations for the Congregation of the Oratory in London, based on the 1962 Roman Breviary. It details the proper texts and rubrics for the Oratory's celebrations, updated to reflect contemporary liturgical practice and scholarship. The text serves as a guide for clergy and laity seeking to observe the Oratorian rite according to the 1962 liturgical books.

This specialized liturgical text is intended for a specific audience within the Catholic Church, particularly those associated with or interested in the Oratorian tradition in London. Its value lies in its precise adherence to the 1962 rubrics and its updated content, making it a practical resource for liturgical observance. The inclusion of corrected typos and an updated table of contents enhances its usability for scholars and practitioners alike. The text's focus on specific Oratorian variations ensures its relevance for those seeking to understand or implement this particular rite.