 Whilst working at St George's, Hanover Square, he realised that church choirs lacked a definitive book of Christmas carols, and felt that a single book would be more convenient than using separate pieces of sheet music and hymn books.Under his direction, the first book of "Carols for Choirs" was commissioned.To edit the collection, Morris enlisted David Willcocks, Director of Music at King's College, Cambridge, and Reginald Jacques, conductor of the Bach Choir.