film is a staple of film education worldwide. English television producer and author Denys Blakeway praised Auden's contributions and the coda sequence which "rescued the documentary from plodding Post Office propaganda and helped to establish the emerging form as a new branch of the arts". Legacy and adaptations Despite its many critical successes, its limited budget, and unfavourable terms for short documentary films under the 1927 Cinematograph Films Act, which required British cinemas present a minimum quota of British feature films, ultimately doomed the GPO Film Unit. The unit's films could not compete with commercial fare and the Treasury's sceptical assessment of its value. The unit disbanded in 1940 and reformed as the Crown Film Unit under the Ministry of Information. Grierson and many other prominent members of the GPO Film Unit continued their work in documentary film in the United Kingdom and abroad. Grierson has subsequently been called "the person most responsible for the documentary film as English speakers have known it". Night Mail itself is sometimes considered the apotheosis of the collaborative work of the GPO Film Unit, a beloved, and nearly unique ode to the Royal Mail, the British people, and the creative possibilities of "actuality" films. The film was widely admired by contemporary critics as well as current scholars, and remains popular with the British public. School children often memorise "Night Mail", and the film has been parodied in advertisements and sketch shows. In 2000, Night Mail was named Best Railway Film of the Century at the Festival International du Film Ferroviaire. In 2002, poet and playwright Tony Harrison was commissioned to "recast" Night Mail for an episode of The South Bank Show. The piece, entitled Crossings, was described by author Scott Anthony as "considerably less believable" than the original Night Mail and comes across as "a cuttings job." 1986 sequel poem In 1986, fifty years after the release of the original film, English poet Blake Morrison was hired to write a poem for a sequel, Night Mail 2, which tells the story of the contemporary mail delivery system. Morrison incorporated the line "uplands heaped like slaughtered horses" into his poem which was originally cut from Auden's version. He concluded: "For that alone, I was pleased to be part of the remake". 1988 British Rail advert In 1988, British Rail produced the "Britain's Railway" television advert which showed the business sectors introduced in 1986. This used