Question: Mortimer was born in Hampstead, London, the only child of Kathleen May (nee Smith) and Clifford Mortimer, a barrister who became blind in 1936 when he hit his head on the door frame of a London taxi but still pursued his career. Clifford's loss of sight was not acknowledged openly by the family. John Mortimer was educated at the Dragon School in Oxford and Harrow School, where he joined the Communist Party, forming a one-member cell. Originally Mortimer intended to be an actor (his lead role in the Dragon's 1937 production of Richard II gained glowing reviews in The Draconian) and then a writer, but his father persuaded him against it, advising: "My dear boy, have some consideration for your unfortunate wife...

With weak eyes and doubtful lungs, Mortimer was classified as medically unfit for military service in World War II. He worked for the Crown Film Unit under Laurie Lee, writing scripts for propaganda documentaries.  I lived in London and went on journeys in blacked-out trains to factories and coal-mines and military and air force installations. For the first and, in fact, the only time in my life I was, thanks to Laurie Lee, earning my living entirely as a writer. If I have knocked the documentary ideal, I would not wish to sound ungrateful to the Crown Film Unit. I was given great and welcome opportunities to write dialogue, construct scenes and try and turn ideas into some kind of visual drama.  He based his first novel, Charade, on his experiences with the Crown Film Unit.  Mortimer made his radio debut as a dramatist in 1955 with his adaptation of his own novel Like Men Betrayed for the BBC Light Programme. But he made his debut as an original playwright with The Dock Brief starring Michael Hordern as a hapless barrister, first broadcast in 1957 on BBC Radio's Third Programme, later televised with the same cast and subsequently presented in a double bill with What Shall We Tell Caroline? at the Lyric Hammersmith in April 1958 before transferring to the Garrick Theatre. It was revived by Christopher Morahan in 2007 as part of a touring double bill, Legal Fictions.  His play A Voyage Round My Father, given its first radio broadcast in 1963, is autobiographical, recounting his experiences as a young barrister and his relationship with his blind father. It was memorably televised by BBC Television in 1969 with Mark Dignam in the title role. In a slightly longer version the play later became a stage success (first at Greenwich Theatre in 1979 with Dignam, then a year later at the Theatre Royal Haymarket, now starring Alec Guinness). In 1981 it was remade by Thames Television with Laurence Olivier as the father and Alan Bates as young Mortimer. In 1965, he and his wife wrote the screenplay for the Otto Preminger film Bunny Lake is Missing, which also starred Olivier.

Using a quote from the above article, answer the following question: When did he write Charade?
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Problem: "Hound Dog" is a twelve-bar blues song written by Jerry Leiber and Mike Stoller. Recorded originally by Willie Mae "Big Mama" Thornton on August 13, 1952, in Los Angeles and released by Peacock Records in late February 1953, "Hound Dog" was Thornton's only hit record, selling over 500,000 copies, spending 14 weeks in the R&B charts, including seven weeks at number one. Thornton's recording of "Hound Dog" is listed as one of the Rock and Roll Hall of Fame's "500 Songs That Shaped Rock and Roll", and was inducted into the Grammy Hall of Fame in February 2013. "Hound Dog" has been recorded more than 250 times. The best-known version is the July 1956 recording by Elvis Presley, which is ranked number 19 on Rolling Stone magazine's list of the 500 Greatest Songs of All Time; it is also one of the best-selling singles of all time.

Two records were released that were neither cover versions of nor answers to Thornton's release, yet used a similar melody without any attribution to Leiber and Stoller. The first was Smiley Lewis's "Play Girl", credited to D. Bartholomew and released by the Imperial Records label (Imperial 45-5234) by the end of March 1953. Described as a "stomping uptempo boogie rocker", it began: "You ain't nothin' but a Play Girl / Staying out all night long". In April 1955, female impersonator Jesse "Big 'Tiny'" Kennedy recorded "Country Boy" accompanied by His Orchestra that was released by RCA's Groove Records (Groove 4G-0106) by May 21. While credited solely to Kennedy, this song has a similar melody to "Hound Dog": "'Country Boy' has a deceptively slouching flip on the 'Hound Dog' motif - this time with Tiny proclaiming proudly that he 'ain't nothing but a country boy'".  In the early 1970s Robert Loers, owner of Dutch label Redita Records, found a song with the same melody as "Hound Dog" called "(You Ain't Nuttin' But a) Juicehead" on an anonymous acetate at Select-o-Hits, the Memphis distributorship owned by Sam Phillips' brother, Tom, where Sun artifacts were stored.  When Juice Head first appeared on a Redita Records LP [in 1974], it was credited to Rosco Gordon. But it's not Rosco. It simply is not him. Really. Even Rosco confirmed that. It might not even be a Memphis Recording Service demo. Just substitute the words "Hound Dog" for "Juice Head" and what have you got? Of course the inspiration for this song came from Big Mama Thornton's "Hound Dog" or perhaps even from Rufus Thomas' "Bear Cat". But the song's other parent is Eddie Vinson's slowed down "Juicehead Blues" which harks to the previous decade...If indeed this originated from Sam Phillips' studio, it was nothing that Phillips needed to touch because it was another lawsuit waiting to happen."  Philip H. Ennis sees "Two Hound Dogs", which was recorded on May 10, 1955, by Bill Haley & His Comets (Decca 29552), as a response to Thornton's recording. While not an answer record in the traditional sense, the lyric characterized "Rhythm" and "Blues" as the titular "Two Hound Dogs," an apparent testament to the stature of "Hound Dog."

What is significant about this passage?

Answer with quotes:
In the early 1970s Robert Loers, owner of Dutch label Redita Records, found a song with the same melody as "Hound Dog" called "(