The Book of Common Prayer (BCP; also known as the Prayer Book) is the traditional service book of the Church of England, and is central to its faith. Compiled in the sixteenth century by Thomas Cranmer, and modified in 1662, the Prayer Book remains at the heart of our worship, and is the official doctrinal standard of the Church of England, as well as of most other Churches in the worldwide Anglican Communion.
You can find out more about the Book of Common Prayer here