[2] In 1977, he entered Ridley Hall, Cambridge, an Anglican theological college, and spent two years training for ordained ministry.
[2] Henderson was made a deacon in the Church of England at Michaelmas 1979 (30 September), by Gerald Ellison, Bishop of London, at St Paul's Cathedral,[4] and ordained a priest the Michaelmas following (28 September 1980), by Jim Thompson, Bishop of Stepney, in his title church.
[5] He then served his three-year title post as assistant curate at St Mary's, Islington, London, being ordained a priest after the first year.
[6] While at Claygate, Henderson served as rural dean for Emly deanery from 1996 until 2001 and was made an honorary canon of Guildford Cathedral in 2001.
[10] In July 2024, he was commissioned by the Church of England Evangelical Council as an "overseer" to provided alternative spiritual oversight (not to be confused with the Church of England's official alternative episcopal oversight) to evangelical clergy and parishes in the Church of England who maintain traditional teaching on the doctrine of marriage and sexual ethics, following the General Synod's support for the introduction of a service of blessing for same sex couples.