John Wesley attributed the tune HELMSLEY to Thomas Olivers in Wesley's 1765 Sacred Melodies with his brother's text of "Lo! He Comes with Clouds Descending." However, Olivers is said to have heard the tune on the street somewhere. Since the first line resembles a tune by violinist and composer Thomas Augustine Arne composed for Thomas and Sally, or The Sailor's Return in 1761, it is speculated the tune was composed by Arne. Most likely, the tune comes from a 1763 edition Martin Madan's Collection of Psalms and Hymn Tunes Sung at the Chapel of Lock Hospital. Madan was the chaplain at Lock Hospital.
From Let the people sing: hymn tunes in perspective by Paul Westermeyer, 2005, GIA Publications, Inc.