During Lent it is customary to recite the so called Seven Penitential Psalms followed by the Litany (though it is not necessary to recite the Litany every time these Psalms are said – the Psalms may be said without the Litany). The Anglican Breviary contains the following directions:
These Psalms, when they are to be recited in Choir, are said kneeling, and the most fitting place for their recitation is at the end of Matins and Lauds, immediately after “Thanks be to God” has been said; out of Choir they are said as opportunity serveth.
So that for those who want add this Lenten discipline to their daily prayer can do so. Immediately after having finished Lauds as soon as Thanks be to God has been said and before May the souls of the faithful … the Antiphon for the Seven Penitential Psalms is begun. After the psalms have been finished one may resume the Office with Prime and the Martyrology (the latter is always read for the following day). See the Anglican Breviary p. S91 for the Seven Penitential Psalms and their Antiphon.