After 13 years at Downside, then-Abbot Sigebert Trafford instructed Orchard to take on the headship of Ealing Priory School. The school, which had been established in 1902 as a dependency of Downside, was by 1945 in a state in which closure rather than growth seemed the more likely prospect. Orchard, however, threw himself into the task of revitalising the school, which he renamed St Benedict's School, and by 1947 succeeded in achieving recognition by the Ministry of Education as efficient. In 1951 Orchard was admitted to the Headmasters' Conference, giving St Benedict's the status of a public school, the only Catholic day school to achieve this position. By 1959, Abbot Rupert Hall of the by-then independent Ealing Abbey, was concerned that Orchard's ambitions for the school exceeded the financial capability of the monastic community, and requested that Orchard resign his position as headmaster in 1960. The death of his successor after just one term and the resignation of his successor after five years resulted in Orchard being called upon to resume the headship of the school in 1965, a position he held until a further dispute over his ambitions for expansion led to his resignation a second time in 1969.
Biblical Scholar
After completing his biblical commentary in 1951, and in addition to his headmaster's duties, Orchard embarked with Reginald C. Fuller, his erstwhile fellow Ealing Priory pupil, on producing a new translation of the Bible, suitable for both liturgical and academic use, which was published in 1967. Aged 60, free from stewardship of the school, Orchard resumed his career as a biblical scholar in earnest. He participated in the establishment in 1969 and was the second General Secretary of the and, displaying the same vigour evident in his revival of St Benedict's School, organised and financed a series of international conferences on the Gospels. During the 1970s he spent four years as spiritual director of the in Rome and took up the position of Visiting Professor of New Testament Studies at the University of Dallas before returning to Ealing for the remainder of his life. Following in the footsteps of his mentor Christopher Butler, Orchard promulgated, in the face of general scholarly scepticism, the Griesbach hypothesis, which he renamed the Two-Gospel Hypothesis, which maintained that the Gospel of Matthew was the first and the Gospel of Mark the third, being a synthesis of Matthew's Gospel and the Gospel of Luke. Into his old age he remained a familiar face in biblical circles, lecturing worldwide in support of his hypothesis. Aged 95, he publicly declined the invitation of Cormac Murphy-O'Connor, the Archbishop of Westminster to attend a lecture which would support the priority of Mark's Gospel. Orchard's researches and ideas, regarding the gospels, have been saved on www.churchinhistory.org
Death
After leading the chant at midday on 28 November 2006, Orchard, aged 96, prayed at the bedside of the dying Dom Kevin Horsey. They were the last survivors of the Ealing community before it became independent in 1947. They died within hours of each other that night.
