The tower of St. Margaret's Church in the foreground, the twin towers of Westminster Abbey behind. The Collegiate Church of St. Peter at Westminster, more commonly called Westminster Abbey, is a Royal Peculiar, meaning that it falls directly under the jurisdiction of the British Monarch rather than a bishop. St. Margaret's Church is the parish church of the House of Commons. Members of Parliament are permitted to be married in St. Margaret's, a prerogative used by Winston Churchill on September 12, 1908 when he married Clementine Hozier.