The year 1960 was a watershed in the creation of a modern Catholic church architecture, not least because it was then that one of the most important books for church design of the twentieth century was published. Peter Hammond’s Liturgy and Architecture set out for architects and clergy the case for a modern church architecture based primarily on the function of liturgy. Hammond argued that the basilican form of church had developed in the Middle Ages to enshrine an excessively clerical liturgy remote from the congregation. Instead, he urged a church architecture that promoted congregational involvement, a ‘corporate worship’, which, he thought, would recapture the spirit of early Christian liturgy.1 The Anglican church of St Paul at Bow Common in London by Robert Maguire and Keith Murray opened the same year and was widely published in connection with Hammond’s arguments. The book and the building contributed to an architectural discourse that outlined a new approach to church design, drawing from the liturgical movement in the Roman Catholic Church, already then gaining ground in Britain, and substantially inuencing architects and clergy in the design of Catholic churches. This chapter examines some pioneering examples of architectural and clerical collaboration in producing this new liturgical architecture.