If you are interested in historical English liturgy, then you ought to be checking for new material over on Dr. William Renwick’s Sarum Rite page on a regular basis. The number of sound files as well as text/music files are truly staggering.
One of the relatively new items definitely deserves a highlight. John Hackney has done a transcription of the revised Sarum old ordinal (the Risby Ordinal) found in BL Harley 1001. As much as I love and respect W. H. Frere, his edition of this text was and is simply untenable. The work presented here is terrific and has a great set of footnotes accompanying it as well.
If medieval English liturgy is your thing, be sure to download it.