From the Latin Mass Society of England and Wales via New Liturgical Movement:
PRESS RELEASE FROM THE LATIN MASS SOCIETY
For Immediate Release10 November 2008

* Traditional Mass Can be Celebrated on Traditional Feast Days, Says Rome
Transferred Holydays of Obligation: an Important Clarification From the Pontifical Commission Ecclesia Dei
In April 2008, the Bishops’ Conference of England and Wales sought a ruling from the Pontifical Commission Ecclesia Dei aimed at harmonising the celebration of certain Holy Days of Obligation in the Extraordinary and Ordinary Forms of the Roman Rite. The bishops had, in the case of the Epiphany, the Ascension and Corpus Christi, transferred these to specific Sundays and in the case of all other Holy Days of Obligation that are kept in England and Wales, with the exception of Christmas, transferred them also to specific Sundays, whenever they fall on a Saturday or a Monday. They wished to ensure that these Holy Days were also kept on Sundays by those attached to the Extraordinary Form.

Consequently, the Bishops’ Conference submitted a dubium to Rome but declined to release the full text or of Ecclesia Dei’s reply. The LMS therefore submitted its own dubium to Rome in July and a reply, dated 20 October, has now been received.

The reply from the Ecclesia Dei Commission confirms that the Mass and Office of Holy Days can continue to be said on the days prescribed in the calendar for the Extraordinary Form and that the right to use this calendar is intrinsic to the right to use the Extraordinary Form.

The LMS’s letter requested confirmation that:
I. the legitimate use of the liturgical books in use in 1962 decreed by the Sovereign Pontiff in Summorum Pontificum includes the right to the use of the calendar intrinsic to those liturgical books.
II. That, whilst in accordance with Canon 1246 the Episcopal Conference with the approbation of the Holy See legitimately transfers Holydays of Obligation or suppresses the obligation of Holydays, it is legitimate to celebrate the Mass and Office of those feasts on the days prescribed in the calendar of the liturgical books in use in 1962 with the clear understanding that, in accordance with the legitimate decision of the Episcopal Conference, there is no obligation to attend Mass on those days.
III. That, in accordance with nn. 356-361 of the Rubricae generales Missalis romani of 1962, it is appropriate to celebrate the external solemnity of Holy Days on the Sunday to which they have been transferred by the Episcopal Conference as has been customary in many other countries hitherto.
Ecclesia Dei’s reply stated:
“1. The legitimate use of the liturgical books in use in 1962 includes the right to the use of the calendar intrinsic to those liturgical books.
2. While in accordance with Canon 1246 §2 of the Code of Canon Law the Episcopal Conference can legitimately transfer Holydays of obligation with the approbation of the Holy See, it is also legitimate to celebrate the Mass and Office of those feasts on the days prescribed in the calendar of the liturgical books in use in 1962 with the clear understanding that, in accordance with the legitimate decision of the Episcopal Conference, there is no obligation to attend Mass on those days.
3. Thus, in accordance with nn. 356-361 of the Rubricae Generales Missalis Romani of 1962, it is appropriate to celebrate the external solemnity of Holy Days on the Sunday to which they have been transferred by the Episcopal Conference, as has been customary in many other countries hitherto.”
Ecclesia Dei’s reply is signed by its Vice-President, Mgr Camille Perl.
[…]
The full texts of the LMS’s dubium and the Ecclesia Dei reply can be seen on the LMS’s website: http://www.latin-mass-society.org