GIRM wrote:393. ........
In England and Wales:
.........Bearing in mind the important place that singing has in a celebration as a necessary or integral part of the Liturgy, all musical settings of the Ordinary of the Mass, texts for the people’s responses and acclamations and for special rites that occur in the course of the liturgical year must be submitted to the Conference of Bishops of England and Wales for review and approval prior to publication.
Likewise it is for the Conference to judge which musical forms, melodies, and musical instruments may be lawfully admitted into divine worship,insofar as these are truly suitable for sacred use, or can be made suitable.
Is that what you are thinking of JW? That's about Mass texts, not hymnals.
If, however, you are thinking of paragraph 48: "............ and whose text has been approved by the Conference of the Bishops of England and Wales", the whole Conference has surely given approval for the entire contents of the new Laudate and CFE collections in that the Liturgy Office has facilitated the grant of an imprimatur for those collections by the local Ordinary of the publishers.
Implicitly, the contents of the new editions of these two hymnals is, to date, the Bishops' approved list. It's a list that will expand as other publications are submitted in the future.
What has not been made known, as yet, is the hoped-for, approved core repertoire that Martin Foster and others were working on. I think the idea behind that could have been to say to publishers that if you are going to publish a Catholic hymn book, then here are X number of hymns and songs - a basic repertoire - that the Bishops want you to include. Whether or not that will ever happen is anyone's guess.