I suspect Couratin of having the large hand in producing this booklet, because when I was a seminarian at Staggers under Fr Derek Allen, the liturgical dispositions put in place by Canon Couratin were still in place. There was a particular style about them; that of accommodating Anglican formulae to a Tridentine Roman mindset. I can't express it better than thus, and with the following examples, which those of you with a certain sort of background will understand: at the Divine Office, we used to say the Collect of the Day with the standard longer conclusion, then the last two of the three final collects sub una conclusione with the longer ending after the last one (instead of Cranmer's varied conclusions after each one). At the start of Lent, a notice went up signed by the Bishop of the Diocese formally dispensing members of the House from the strict observance of the Lenten Fast. Mass Practice sessions inculcated the Tridentine ceremonial even in the case of seminarians who would, in their title parishes, be marrying up that ceremonial to Cranmer's libretto. So Couratin's my hunch; but, out of honesty, I'd better give you evidence for different conclusions.
When Kirk became Bishop of Oxford, certain changes were made which are described in the biography of Kirk written by his son-in-law, Eric Kemp, long-time Bishop of Chichester. These were masterminded by his friend Canon Dr N P Williams [who also used to help out at S Thomas's]. Christmas, Easter, Ascension, Pentecost were henceforth marked by a Pontifical High Mass. Kirk was given a full set of pontifical vestments, which he used on these and other occasions (they may the ones which he bequeathed to his episcopal son-in-law). "The ceremonial of the ordination was carefully worked out by Williams and E C Ratcliff, and later on was under the direction of A H Couratin ...". Ratcliff was a most distinguished liturgist with a passion for the Roman Canon; he did a great deal in collaboration with Couratin, who had an instinctive understanding of his mind. If the little booklet I am examining was the product of Ratcliff and Couratin working together, this would fit the data. It's just that I am a trifle doubtful about evidence for Williams' hand in it. (He was dead by the time of the publication of the booklet; but, of course, there could have been an earlier version of the booklet.)
So, when in the next instalments, I refer to "Couratin", what I really mean is ... whichever of these three, severally or in which combinations, did it.