Question: Do They Know It's Christmas? was the biggest selling single in the UK until the singer who worked with which lyricist took over the title in 1997?
Context: Gold: Greatest Hits is the first greatest hits album released by pop group Steps.  It reached #1 in the UK charts.  The lead single from the album was "Chain Reaction" a cover of Diana Ross's 1986 hit, the single reached #2 in the UK charts and was the group's highest selling single since "Say You'll Be Mine/Better The Devil You Know".  The second single from the album, "Words Are Not Enough", a slow ballad was released with a cover of "I Know Him So Well" from Abbamania.  The single was notably Steps' first single to have an accompanying video that was almost fully animated and did not feature a dance routine like their video for "Heartbeat".  The single reached #5 in the UK charts and was their lowest selling single to date.  A release for "Baby Don't Dance" was planned for 2002 but was scrapped due to the group's split although promotional copies surfaced before the release of The Last Dance. The Glenlivet distillery is a distillery near Ballindalloch in Moray, Scotland that produces single malt Scotch whisky.  It is the oldest legal distillery in the parish of Glenlivet, and the production place of the Scottish whisky of the same name.  It is described in packaging and advertising as "The single malt that started it all".  It was founded in 1824 and has operated almost continuously since.  The distillery remained open throughout the Great Depression and its only closure came during World War II.  The Glenlivet distillery has grown in the post-war period to become one of the biggest single malt distilleries in order to keep up with global demand; The Glenlivet brand is the biggest selling single malt whisky in the United States and the second biggest selling single malt brand globally. "Stay" is a song by UK based pop act Shakespears Sister, released by London Records in January 1992 as the second single from their album "Hormonally Yours".  Upon release, the single became a global smash hit becoming the duo's first and only No. 1 single in numerous territories, including the UK, where it topped the UK Singles Chart for eight consecutive weeks; the longest UK No. 1 reign for any all-female band, and was the fourth biggest selling single of 1992.  The single also held the No. 1 position in band member Siobhan Fahey's birthplace, Ireland, for six weeks, and it was a transatlantic hit reaching No. 4 on the "Billboard" Hot 100 in the US. The singles discography of British musician/singer-songwriter Elton John consists of 133 official singles and 17 as featured artist, as well as 47 other non-single guest appearances.  Across his career, John has yielded 57 top 40 hits in the United States, only second to Elvis Presley in total, with 27 of those hitting the top ten and 9 achieving number-one.  In his native United Kingdom, he has accumulated 69 top 40 singles, including 32 top tens and 7 number-ones.  In 1997, John released the double A-side single "Something About the Way You Look Tonight"/"Candle in the Wind 1997" in dedication to the memory of Diana, Princess of Wales.  It subsequently hit number-one in every country that it charted in and became the biggest selling single of all-time since the UK and US charts began in the 1950s, with sales of 33 million.  John has sold 100 million singles worldwide. "Whole Again" is the fifth single released from British pop girl group Atomic Kitten's debut album, "Right Now" (2000).  It is the group's biggest selling single to date and was the final single to feature founding member Kerry Katona, who left the group midway through promoting the single.  "Whole Again" was the first single released from the album in Europe, Australia, New Zealand and South Africa.  It was a massive success, reaching number one in several countries, and selling over a million copies in the UK alone. This is a summary of the year 2007 in British music.  It was the first year of digital downloads being fully integrated into the charts, leading to many songs not given physical releases to enter the chart on download sales alone.  Leona Lewis had the most successful single of the year with "Bleeding Love", which achieved sales of 787,652 copies.  Her album "Spirit" became the fastest-selling debut album of all time in the UK.  Rihanna spent ten weeks at number one with "Umbrella", the longest stay for any artist at number 1 for thirteen years and the second best selling single of the year, and Amy Winehouse had the biggest selling album of the year with "Back to Black". Sir Elton Hercules John, (born Reginald Kenneth Dwight; 25 March 1947), is an English singer, pianist, and composer.  He has worked with lyricist Bernie Taupin as his songwriting partner since 1967; they have collaborated on more than 30 albums to date.  In his five-decade career Elton John has sold more than 300million records, making him one of the best-selling music artists in the world.  He has more than fifty Top 40 hits, including seven consecutive No. 1 US albums, 58 "Billboard" Top 40 singles, 27 Top 10, four No. 2 and nine No. 1.  For 31 consecutive years (1970–2000) he had at least one song in the "Billboard" Hot 100.  His tribute single, re-penned in dedication to the late Princess Diana, "Candle in the Wind 1997" sold over 33million copies worldwide and is the best-selling single in the history of the UK and US singles charts.  He has also composed music, produced records, and has occasionally acted in films.  John owned Watford Football Club from 1976 to 1987, and 1997 to 2002.  He is an honorary Life President of the club, and in 2014 had a stand named after him at the club's home stadium. "Do They Know It's Christmas?"  is a song written in 1984 by Bob Geldof and Midge Ure in reaction to television reports of the 1983–85 famine in Ethiopia.  It was first recorded in a single day on 25 November 1984 by Band Aid, a supergroup put together by Geldof and Ure and consisting mainly of the biggest British and Irish musical acts at the time.  The single was released in the United Kingdom on 3 December 1984 and aided by considerable publicity it entered the UK Singles Chart at number one and stayed there for five weeks, becoming the Christmas number one of 1984.  The record became the fastest selling single in UK chart history, selling a million copies in the first week alone and passing 3 million on the last day of 1984, on the way to becoming the biggest selling single of all time in the UK.  It held this title until 1997 when it was overtaken by Elton John's "Candle in the Wind 1997", released in tribute to Princess Diana following her death.  The original version of "Do They Know It's Christmas?"  has sold 3.8 million copies in the UK to date. "Nothing's Gonna Stop Us Now" is a 1987 song co-written by Albert Hammond and Diane Warren, recorded by the American rock band Starship in 1986.  It is a duet featuring Starship vocalists Grace Slick and Mickey Thomas.  Featured as the theme to the romantic comedy film "Mannequin", it hit No. 1 in the "Billboard" Hot 100 on April 4, 1987 and reached No. 1 on the UK Singles Chart for four weeks the following month and became the UK's 2nd biggest selling single of 1987.  The song also reached the top 10 in six European countries.  The single became the first number one single by songwriter Diane Warren.  At the time, it made Grace Slick (aged 47) the oldest woman to have a number one single in the United States though the record was later broken by Cher's "Believe" in 1999 (aged 52). Queen are a British rock band, which consisted of vocalist Freddie Mercury (d. 1991), guitarist Brian May, bassist John Deacon, and drummer Roger Taylor.  Founded in 1970, Queen released their self-titled debut album in 1973.  Despite not being an immediate success, Queen gained popularity in Britain with their second self-titled album in 1974.  Their 1975 single, "Bohemian Rhapsody", was number 1 for nine weeks (and a further five weeks in 1991) and is the third biggest selling single of all time in the UK.  The band's 1981 "Greatest Hits" album is the biggest selling album in UK history with 6.0 million copies sold by 2014.  The band's 1991 compilation "Greatest Hits II" is also one of the UK's top ten biggest sellers of all time, with 3.8 million copies sold by 2012.
Answer: Bernie Taupin