The Church of Ireland and Its Prayer Book. MICHAEL DEWAR. I have on my shelves a copy of The Book of Common Prayer according to the use of the United. Perhaps contrary to popular belief, the Book of Common Prayer (BCP) has not Church of Ireland in , changes were made to the Prayer Book and a. The Book of Common Prayer (BCP) is the official resource for structuring and Every service in the book is linked to here, the links are to the official Church of Ireland website, Please feel free to download them as PDF or RTF formats.