A joint statement on the new protocol from Nichols and the Anglican Communion's head, Archbishop Rowan Williams of Canterbury, was issued at the same time in London. The joint statement said that the development reflected "substantial overlap in faith, doctrine and spirituality between the Catholic Church and the Anglican tradition" and affirmed "on-going official dialogue between the Catholic Church and the Anglican Communion", including the Anglican Roman Catholic International Commission (ARCIC) and International Anglican Roman Catholic Commission for Unity and Mission (IARCCUM).