Ash Wednesday is the beginning of Lent. The full Lenten Propers, however, will not be in use until Sunday. The ancient use of Sarum would have us say the 15 Gradual Psalms each ordinary weekday in Lent as well as the 7 Penitential Psalms at each of the Seven Day Hours on such an ordinary weekday. That may be a feasible thing for those in need of sever penance (who isn’t ? ) and who also have no day-job and family to concern themselves with. Those of us in need of said penance but who do have day-jobs might instead give up some more time for Lent and add the following devotions:
On Monday: the Office of the Dead immediately following Vespers of the day
On Wednesday: the Gradual Psalms immediately preceding Matins
On Friday: the Seven Penitential Psalms with the Litany immediately following Lauds
Throughout the entire Lenten period. Though fasting and abstinence are important, the focus on prayer is even more so. The Roman Catholic Church has some sensible guidelines regarding fasting and abstinence here: Fasting & Abstinence. Anglican Catholics, as Catholics, have nothing to lose from looking at our Mother Church’s suggestions especially of they are good and sensible ones! So I suggest those guidelines and the devotions mentioned above for Lent. The Litany as contained in the BCP (as far as I am concerned) makes a mockery of the traditional Litany (of the Saints) and fails to serve the traditional (Catholic) purpose of that Litany. The emendations recommended in Ritual Notes and/or the Anglican Breviary are recommended.
The Seven Penitential Psalms and the Gradual Psalms may be found in this pdf document: Penitential & Gradual Psalms (Orthodox Western Rite version). The Litany is included in the Anglican Breviary (as are the Seven Penitential Psalms, but having them grouped together has its advantages).
Have a blessed Lent.