The members include most of the major churches in England, Scotland, Wales and Ireland.
As of 2022[update] the General Secretary is Nicola Brady, who succeeded Bob Fyffe.
Its stated aims are to "serve the churches of the four nations on their shared journey towards full visible unity in Christ" and works in areas of Faith and Order, Mission, Inter Faith, Church and Society, Racial Justice, International Affairs and International Students.
It also produces material for the "Week of Prayer for Christian Unity" and "Racial Justice Sunday".
CTBI, unlike its predecessor the British Council of Churches, includes the Catholic Bishops' Conferences of England and Wales and of Scotland as full members, and the Catholic Bishops' Conference of Ireland as an Associate Member.