Question: Which famous London landmark served as the opening logo for London Films Productions movies?
Context: The building known as the London Planetarium is in Marylebone Road, London.  It is adjacent to Madame Tussauds and is owned by the same company.  A famous London landmark, it was once a notable tourist attraction, housing a planetarium, which offered shows relating to space and astronomy. As a prominent London landmark, the London Eye (also known as the Millennium Wheel) often appears in popular culture. Kolavennu is a village in Krishna District of the Indian state of Andhra Pradesh.  It is located in Kankipadu mandal of Nuzvid revenue division.  It was named after the riches and investment capabilities of people living in the area viz KOtlu LAkshalu VElu NoorlU (crores, lakhs, thousands, hundreds).  Kolavennu has some of earliest producers of Telugu Talkie Kovelamudi bhaskar rao followed by Kancharla Narayana rao who is also a film distributor Premier films, Jyothi films and Kancharla Madhav Rao.  A S R Anjaneyulu producer of Pandavavanavasam also hails from this place.  Atisit Mikkilineni hails from Kolavennu.This is also the village where Producer Dr. D. Ramanaidu has built a Ganapathi Temple which is shown in Suresh Productions movies' intro banner. Wilhelm Cramer (2 June 1746, Mannheim – 5 October 1799, London) was a famous London violinist and musical conductor of German origin.  He was one of a numerous family who were identified with the progress of music during the 18th and 19th centuries.  Wilhelm Cramer is the father of the famous Johann Baptist Cramer (24 February 1771 – 16 April 1858) (English musician of German origin). London Films Productions is a British film and television production company founded in 1932 by Alexander Korda and from 1936 based at Denham Film Studios in Buckinghamshire, near London.  The company's productions included "The Private Life of Henry VIII" (1933), "Things to Come" (1936), "Rembrandt" (1936), and "The Four Feathers" (1939).  The facility at Denham was taken over in 1939 by Rank and merged with Pinewood to form D & P Studios.  The outbreak of war necessitated that "The Thief of Bagdad" (1940) was completed in California, although Korda's handful of American-made films still had Big Ben for their opening corporate logo. Big Ben is the nickname for the Great Bell of the clock at the north end of the Palace of Westminster in London and is usually extended to refer to both the clock and the clock tower as well.  The tower is officially known as Elizabeth Tower, renamed to celebrate the Diamond Jubilee of Elizabeth II in 2012; previously, it was known simply as the Clock Tower. Mortlake is a suburban district of the London Borough of Richmond upon Thames on the south bank of the River Thames between Kew and Barnes.  Historically it was part of Surrey and until 1965 was in the Municipal Borough of Barnes.  For many centuries it had village status and extended far to the south, to include East Sheen and part of what is now Richmond Park.  Its Stuart and Georgian history was economically one of malting, brewing, farming, watermen and a great tapestry works.  A London landmark, the former Mortlake Brewery or Stag Brewery, is on the edge of Mortlake. Thavie's Inn was a former Inn of Chancery, associated with Lincoln's Inn, established at Holborn, near the site of the present side street and office block still known as Thavies Inn Buildings.  "Thavie's Inn" is one of the earliest Inns of Chancery on record, both by date of establishment and dissolution.  It remains a well-known City of London landmark, where Lloyd's Bank is situated, on the opposite side of Holborn Circus from Ely Place. A production logo, vanity card, vanity plate, or vanity logo is a logo used by movie studios and television production companies to brand what they produce and to determine the production company and the distributor of a television show or film.  Production logos are usually seen at the beginning of a theatrical movie or video game (an "opening logo"), or at the end of a television program or TV movie (a "closing logo").  Many production logos have become famous over the years, such as the 20th Century Fox's monument and searchlights, Paramount Pictures' mountain, Universal Pictures' spinning globe, Warner Bros.' shield, Columbia Pictures' personification of Columbia, MGM's Leo the Lion, and Walt Disney Pictures' fantasy castle.  Unlike logos for most other media, production logos can take advantage of motion and synchronized sound, and almost always do. Counsel's Opinion is a 1933 British romantic comedy film starring Henry Kendall and Binnie Barnes.  It was one of three films directed in Britain in the early 1930s by Canadian-American Allan Dwan and was an early production from Alexander Korda's London Films.  "Counsel's Opinion" was based on a 1931 Gilbert Wakefield play and was remade, again by London Films, in 1938 as "The Divorce of Lady X" starring Laurence Olivier and Merle Oberon.
Answer: Big Ben