A book called The Common Catechism was recently published in an English translation. This joint work of Protestant and Roman Catholic theologians, a best seller when it appeared in Germany, suggests that four-fifths of the issues that have divided Christians are now common ground between them. The question remains: is the remaining one-fifth the tip of an iceberg on which the prospects for Christian reunion might yet founder? The Rev Trevor Beeson , Vicar of Ware, chairs a discussion between: CANON GEOFFREY lamps, Regius Professor of Divinity at Cambridge University, CANON JOHN MACQUARRIE , Lady Margaret Professor of Divinity at Oxford University. FATHER JOHN COVF. NTRY sj, Lecturer in Christian Doctrine at Heythrop College, London, and DAVID MARTIN , Professor of Sociology at the London School of Economics. Producers ADRIAN JOHNSON and HUBERT HOSKINS followed by an interlude