Although the Book of Common Prayer, in its present form, was published in 1662, it is still a greatly loved service book throughout the world.
Many churches still use it for their liturgical worship.
Yet the world has changed. We don't commonly speak the language of the seventeenth century. Even the pace of life is different. An Australian Prayer Book, first published in 1978, is but one example of a conservative revision of the 1662 English Book of Common Prayer. The book has retained the feel of the Book of Common Prayer and so is useful for a small church or house-church community where a more modern English, but conservative, liturgical service is desired.