Act of Uniformity 1559
Liturgical conformity in the Church was not established until 1549, when Parliament in a constitutionally significant move passed an Act of Uniformity, which enforced the use of a book of common prayer. The Prayer Book, which had been drafted by Thomas Cranmer, the Archbishop of Canterbury and protestant reformer, was replaced by a second and more radical version in 1552.
The reign of Mary I saw the execution of Cranmer and the brief restoration of Catholicism, together with a return to earlier orders of service. Following the accession of Elizabeth I a third Act of Uniformity (pictured) was passed in 1559, authorising a book of common prayer which was similar to the 1552 version but which retained some Catholic elements.
Act of Uniformity, Public Act, 1 Elizabeth I, c. 2
Parliamentary Archives, HL/PO/PU/1/1558/1Eliz1n2