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The archbishop of Canterbury, Justin Welby, this week summoned the 37 heads of the worldwide Anglican Communion to a summit meeting to be held in January. Edward Stourton speaks to canon Dr Chris Sugden and rev Colin Coward about what the move could mean for the Communion and the Church of England.. As pope Francis arrives in Cuba, Bob Walker reports on the turbulent history of Communism and the Catholic Church in the country. Pope biographer Paul Vallely and fr James Keenan, director of the Jesuit Institute, Boston College, look ahead to the Pontiff's upcoming visit to the US. Hazel Southam reports from the African Biblical Leadership Initiative in Malawi, which has been discussing responses to the migrant crisis and corruption. As the Dalai Lama gives a rare address to thousands of people in London this weekend on the subject of compassion, Alexander Norman, director of the new Dalai Lama Centre for Compassion in Oxford, explores how the centre will seek "to change the way we think about ethics". Young people from the new Community of St Anselm explain why they have chosen to live for a year at Lambeth Palace at the invitation of the archbishop of Canterbury. The Psychoactive Substances Bill, which proposes a blanket ban on legal highs, has led to fears that use of incense in churches could be outlawed. Edward visits an incense-loving church for reaction. Producers: Dan Tierney Peter Everett Editor: Amanda Hancox.