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?

<P0-S0> "Do They Know It's Christmas?" <P0-S1>  is a song written in 1984 by Bob Geldof and Midge Ure in reaction to television reports of the 1983–85 famine in Ethiopia. <P0-S2>  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. <P0-S3>  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. <P0-S4>  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. <P0-S5>  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. <P0-S6>  The original version of "Do They Know It's Christmas?" <P0-S7>  has sold 3.8 million copies in the UK to date. <SEP> <P1-S0> "Whole Again" is the fifth single released from British pop girl group Atomic Kitten's debut album, "Right Now" (2000). <P1-S1>  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. <P1-S2>  "Whole Again" was the first single released from the album in Europe, Australia, New Zealand and South Africa. <P1-S3>  It was a massive success, reaching number one in several countries, and selling over a million copies in the UK alone. <SEP> <P2-S0> Gold: Greatest Hits is the first greatest hits album released by pop group Steps. <P2-S1>  It reached #1 in the UK charts. <P2-S2>  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". <P2-S3>  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. <P2-S4>  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". <P2-S5>  The single reached #5 in the UK charts and was their lowest selling single to date. <P2-S6>  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. <SEP> <P3-S0> Sir Elton Hercules John, (born Reginald Kenneth Dwight; 25 March 1947), is an English singer, pianist, and composer. <P3-S1>  He has worked with lyricist Bernie Taupin as his songwriting partner since 1967; they have collaborated on more than 30 albums to date. <P3-S2>  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. <P3-S3>  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. <P3-S4>  For 31 consecutive years (1970–2000) he had at least one song in the "Billboard" Hot 100. <P3-S5>  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. <P3-S6>  He has also composed music, produced records, and has occasionally acted in films. <P3-S7>  John owned Watford Football Club from 1976 to 1987, and 1997 to 2002. <P3-S8>  He is an honorary Life President of the club, and in 2014 had a stand named after him at the club's home stadium.