Tres Abhinc Annos has some things to say about the Liturgy of the Hours in Chapter V:
19. Pending complete reform of the divine office, on days of class I and class II with a matins of three nocturns, recitation of any one nocturn with three psalms and three readings is permitted. The hymn Te Deum, when called for by the rubrics, comes after the third reading. In the last three days of Holy Week the pertinent rubrics of the Roman Breviary are to be followed.
20. Private recitation leaves out the absolution and blessing before the readings as well as the concluding Tu autem.
Let’s note that even in 1967, the possibility of the laity participating in a public celebration of the Hours was getting some attention:
21. In lauds and vespers celebrated with a congregation, in place of the capitulum there can be a longer reading from Scripture, taken, for example, from matins or from the Mass of the day, or from a weekday lectionary, and, as circumstances suggest, a brief homily. Unless Mass immediately follows, general intercessions may be inserted before the prayer.
When there are such insertions, there need only be three psalms, chosen in this way: at lauds one of the first three, then the canticle, then the final psalm; at vespers any three of the five psalms.
22. At compline celebrated with a congregation participating the psalms can always be those of Sunday.
This has all been uprooted by the “complete reform” mentioned in section 19, but it is instructive to see that the Consilium was on the right track with this.