Using the written records of British folk songs from the 17th to the 20th centuries, the variants of these folk songs and the study of the tune family, the goal of this study is to search for British folk songs that were matched with Christian melodies after the British Reformation, and confirming that some Christian melodies are mixed with musical elements of folk songs of that time (sacred parody). These sacred parodies from folk songs have become the precious historical materials for the study of ancient British folk songs.