St. Margaret's, Westminster (Church : London, England)
Church of St. Margaret (Westminster, London, England)
Parish Church of the House of Commons (London, England)
Saint Margaret's Church (Westminster, London, England)
Notes:
Guide for visitors, 1951 cover (Saint Margaret's Church, Westminster)
Blue Guides, London, 1986 p. 59 (St. Margaret's Church; City of Westminster)
St Margaret's, Westminster : the Common's church within a royal peculiar, 1993
Its webpages on the Westminster Abbey website, 9 Sept. 2013 (St Margaret's Church, Westminster Abbey; standing between Westminster Abbey and the Houses of Parliament, commonly called "the parish church of the House of Commons")
Wikipedia, 9 Sept. 2013 under St Margaret's, Westminster (the church of St. Margaret, Westminster Abbey, is situated in the grounds of Westminster Abbey on Parliament Square, and is the Anglican parish church of the House of Commons of the United Kingdom in London)