Question: Vice Versa is a 1948 British comedy film written and directed by an English actor that served as a Goodwill Ambassador for who?
Context: Vice Versa is a 1916 British silent fantasy film directed by Maurice Elvey and starring Charles Rock, Douglas Munro and Guy Newall.  It is an adaptation of the 1882 novel "Vice Versa" by Thomas Anstey Guthrie.  A schoolboy magically swaps places with his pompous father. Miranda is a 1948 British comedy film, directed by Ken Annakin and written by Peter Blackmore, who also wrote the play of the same name from which the film was adapted.  Denis Waldock provided additional dialogue.  A light comedy, the film is about a beautiful and playful mermaid played by Glynis Johns and her effect on Griffith Jones' character.  Googie Withers and Margaret Rutherford are also featured in the film.  Glynis Johns and Margaret Rutherford reprised their roles in the 1954 sequel, "Mad About Men". Trouble in the Air is a 1948 British comedy film directed by Charles Saunders and starring Freddie Frinton, Jimmy Edwards and Bill Owen.  It was made at Highbury Studios as a second feature.  The film's sets were designed by the art director Don Russell. William Comes to Town is a 1948 British comedy film directed by Val Guest and starring William Graham and Garry Marsh.  It was based on the Just William series of novels by Richmal Crompton.  It served as a loose sequel to 1947 film "Just William's Luck".  It is also known by its U.S. alternative title William Goes to the Circus. Buenos Aires Vice Versa (Spanish: Buenos Aires viceversa ) is an 1996 Argentine and Dutch dramatic film, written and directed by Alejandro Agresti.  The film was produced by Alejandro Agresti and Axel Harding, and co-produced by Emjay Rechsteiner. Vice Versa is a 1948 British comedy film written and directed by Peter Ustinov.  It is the third screen adaptation of the 1882 novel "Vice Versa" by F. Anstey.  The film was produced by Two Cities Films and distributed by General Film Distributors. Sir Peter Ustinov, {'1': ", '2': ", '3': ", '4': "} (born Peter Alexander von Ustinov; or ; 16 April 192128 March 2004) was an English actor, writer, dramatist, filmmaker, theatre and opera director, stage designer, screenwriter, comedian, humorist, newspaper and magazine columnist, radio broadcaster, and television presenter.  He was a fixture on television talk shows and lecture circuits for much of his career.  A respected intellectual and diplomat, he held various academic posts and served as a Goodwill Ambassador for UNICEF and President of the World Federalist Movement. Vice Versa is a 1988 American comedy film starring Judge Reinhold and Fred Savage.  It is the fourth big screen adaptation of the 1882 novel of the same name by F. Anstey.  Three previous adaptations were released in the UK in 1916, 1937 and 1948.  There was also a 1981 UK television series starring Peter Bowles and Iain Cuthbertson. David Hutcheson (14 June 1905 – 18 February 1976) was a British character actor.  He made his film debut in "Fast and Loose" in 1930 and played his only lead role in 1934's "Romance in Rhythm".  He went on to specialize in hooray henrys, silly asses and military types most prominently in Michael Powell and Emeric Pressburger's "The Life and Death of Colonel Blimp" (1943) and Peter Ustinov's "School for Secrets" (1946) and "Vice Versa" (1948).  He continued in film and television until the 1970s.  During the 1960s he often played the role of Colonel Pickering in stage productions of "My Fair Lady". Kal Naga (also credited as Khaled Naga or Khaled Abol Naga) is a multi award-winning actor, film producer and director from Egypt (he directed theatre mostly and short films).  He is a movie star in the Arab World and the Middle East but also a familiar face internationally specially in European film festivals, where he has been honoured with a diverse range of awards as an actor and producer as well as a jury member in film festivals.  Since 2016 he focused on English speaking markets ["Tyrant" TV series season 3 (2016), American FX TV Network, "Vikings" season 5 (2017), History Channel and "The Last Post" TV mini series, UK's BBC TV].  His roles covered a multitude of genres, from musicals ["None but that!"  (2007)], action ["Agamista"(2007), "Eyes Of A Thief" (2014)], thrillers ["Kashf Hesab" (2007)], art-house ["Heliopolis" (2009), "Villa 69" (2013), "Decor" (2014)] and a slapstick comedy ["Habibi Naeman (Sleeping Habibi)" (2008)].  He played the lead in many award-winning films that gained him outstanding international critics acclaim as one of the finest actors in the world today out of the Arab region.  He studied and graduated (with highest honours) as a Tele-communication engineer' from Ain Shams University, studied theatre (as a minor) at the American University in Cairo, and worked on a spacecraft design program (UoSAT-5 ) in the UK.  He finally confirmed his passion and calling for the arts by the year 2000.  In a film festival in 2016 celebrating Arabic films submissions to the "Oscars," he was honoured for being the most submitted actor in Arabic films submissions to the Academy Award for Best Foreign Language Film ("The Oscars)".  He is often tagged in western media as "Egypt's "Brad Pitt" for his many career similarities with the latter, also described as "the next Omar Sharif" specially after his American debut movie "Civic Duty" in 2007.  He was also described as "Egypt's International treasure" for advocating for freedom and standing up against injustice in his home country Egypt.  He is one of the most recognisable faces of the 2011 revolution, seizing the anti-regime sentiment in the streets of Cairo and taking part in mass demonstrations that led to the removal of President Mubarak.  He faced defamation campaigns against him by the state owned and controlled media during Mubarak era before the January 25th 2011 revolution in Egypt, and once again from the 2013 "coup d'etat" General Sisi government in Egypt.  Nonetheless he continued his regional and international award-winning success, as well as waves of strong support on social media.  He also had a very celebrated and successful career across the Arab world TV networks as a TV & radio host in prime time shows from 1997 till 2005.  He is a human and child rights activist and has been Egypt's UNICEF Goodwill Ambassador 2007–2015.  He has worked across a diverse variety of media, including theatre, radio, television and film in Arabic, English and some French and Italian.
Answer: UNICEF