The Clapham Sect was a group of evangelical Christians, prominent in England from about 1790 to 1830, who campaigned for the abolition of slavery and promoted missionary work at home and abroad. The group centred on the church of John Venn, rector of Clapham in south London. Its members included William Wilberforce, Henry Thornton, James Stephen, Zachary Macaulay and others. Stephen Tomkins tells the fascinating...