The services before the Hymns of the Spirit include prayers and litanies from various sources, including the 1903 Devotional Services for Public Worship, by John Hunter. He was the minister of King’s Weigh House Church, then a Congregational church, in Mayfair, London.
You can read it at Archives.org.
I’ll see if there’s any commonalities, and if so I’ll note them below.
Crossposted at HymnsoftheSpirit.org.