That is a nice phrase by Fr Aidan Nichols ... and I offer you a piece today by one of those Anglican Catholic theologians of whom Fr Aidan thinks so well: Fr Eric Mascall of Oxford.
What makes the mass one and corporate is not the fact that a lot of people are together at the same service, but the fact that it is the act of the one Christ in his Body (corpus) the Church. And I can think of no better way of making anyone understand wherein the unity and corporateness of the mass really consists than to take him into a church in which a number of priests are simultaneously celebrating private masses and to say: "Look at those men at their various altars all round the church, each of them apparently muttering away on his own and having nothing to do with the others. In fact they are all of them doing the same thing - the same essentially, the same numerically - not just a lot of things of the same kind, but the very same identical thing; each of them is taking part as a priest in the one redemptive act which Christ, who died for our sins and rose again for our justification, perpetuates in the Church which is his Body through the sacrament of his body and blood."
Mascall used to say his own mass every morning (except when he was on the Cathedral rota for a public mass) in the church where I went for daily mass as an undergraduate. How wonderful it would be if the scene he describes returned to the life of our churches ... just imagine the basilica at Lourdes every morning with a constant coming and going of priests to the altars of the fifteen mysteries.
Those fifteen altars, like so many in the thousands of churches of Latin Christendom, are now left unused ... in the Byzantine phrase, they are left "fasting". Thus is an apostasy which grew up after Vatican II perpetuated.
A little more about this subject tomorrow.