I reprint this from june 2009, in response to a query.
The Roman Canon was, of course, used in the Church of England from her beginning until the Tudor disruptions which climaxed in its outlawing from S John's Day in 1559, nearly 450 years ago. Nearly a thousand years of use must give it a customary claim of great strength.
But its use has not been infinitesimal more recently. In his 1916 Presidential Address to te English Church Union (in those days, the main Anglican Catholic organisation), Viscount Halifax said "At present, as I think you are aware, it is a very general custom ... for many of the clergy - I should put their number at some two thousand, though I believe I might safely put it at three thousand - to ... say the first part of the Latin Canon (silently, of course) before the Prayer of Consecration in the Prayer book, and to complete the Prayer of Consecration with the rest of the Latin Canon".
This estimate is the more striking since Halifax himself advocated a different reform of the Anglican Liturgy: the use of the 1549 rite.
Does anybody know what percentage of the English Clergy that amounts to?