This employment of the word directorium was by no means peculiar to England.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 5: Diocese-Fathers of Mercy] Reference

Now, advantage was taken of this principle in the arrangement of the old Pye or directorium which preceded our present "Ordo".    From Wordnik.com.  [The Catholic Encyclopedia, Volume 5: Diocese-Fathers of Mercy] Reference

As this title suffices to show, a directorium or guide for the recitation of Office and Mass had to be constructed according to the needs of a particular diocese or group of dioceses, for as a rule each diocese has certain saints 'days and feasts peculiar to itself, and these have all to be taken account of in regulating the Office, a single change often occasioning much disturbance by the necessity it creates of transferring coincident celebrations to other days.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 5: Diocese-Fathers of Mercy] Reference