Is there still a present you need to send to a liturgically-minded friend or colleague? If so, I commend the book of this name (CSM), by R J Urquhart, pubd T and T Clark.
It is exacltly what it claims: "A careful Conjecture". For, while it is clear from the Sarum service books, most of the time, what they did solemnly in Salisbury Cathedral, what happened in humbler places and contexts, where Sarum was used in a status declivior, is not. A widely cast net enables Mr Urquhart to give you as much information as is humanly possible.
Readers of this blog will have read herein, several times, something like the following:
"Lots of books will tell you that S Pius V permitted the continued use of medieval rites having a prescription of more than 200 years. This is erroneous. It is so erroneous as to be pretty well the opposite of the truth. He gave NO such permission to anybody."
If you have any book that says this, I ORDER YOU to fetch it at once and put big question-marks against such assertions. THEY ARE CONTRAFACTUAL.
What S Pius did do ... well, if you're not a regular reader of this blog, or if you sometimes forget the wisdom I so generously share, or ... worst of all ... if you don't regard me as a reliable authority, then you need to get CSM instantly and to read carefully Urquhart's explanation of Quo primum. TAKE IMMEDIATE STEPS ...
One detail in CSM seems to me arguable. The Compiler, footnoting 'Reid', suggests that it might be contrary to the mind of the Church actually to celebrate Sarum. But in a letter dated 10 December 2013 (Prot. N. 39/2011L) Archbishop Pozzoli, writing from the then Ecclesia Dei Commission propria manu, says
In relation to your first question, this Dicastery confirms that the Use of Sarum, whilst no longer in regular use, has never been formally abrogated.
In relation to your second question, it is the judgement of this Pontifical Commission that any celebration of the liturgy according to the Use of Sarum is to be carried out under the responsibility and supervision of the Ordinary.
Interesting, yes? Suggestive, yes?
PLEASE take my commendation seriously. This is a massively important book which needs all the support it can get in this age when publishers are naturally nervous about publishing things which might bring them narrow profits. PLEASE don't put it off ... ... PLEASE ...