This may be a bit of a cheat, as I am citing the Book of Common Prayer (1979) as read in the United States. There, "protestant" is used only four times, all in the phrase "Protestant Episcopal Church in the United States of America." But the word has not been a part of the Church's name since 1967, and it may very well be that it never did appear in British editions.

(Responsible for the Book of Common Prayer, Thomas Cranmer was regarded by Belloc as the great dissembler who, through changes in Church liturgy and the very language of the book, itself, succeeded in surreptiously winning Catholic England for the Protestants.)