What your leader (“What unites and what divides the Churches”, 21 June ) calls “the previous vision of church unity” cannot be adequately characterised as a vision “of different denominations merging into one”. The goal of full visible sacramental and ecclesial unity was always envisaged as something that lay beyond present ecclesiastical arrangements, however natural the temptation for separated Churches to imagine the coming “Great Church” to be rather like their own denomination writ large!The commitment of Pope Francis and Archbishop Welby to engage their Churches in collaboration on a range of vital issues concerning justice and human flourishing is very welcome and is an essential dimension of unity. It is both a sign of unity and an i