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?
Do They Know It's Christmas?:  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. Elton John:  He has worked with lyricist Bernie Taupin as his songwriting partner since 1967; they have collaborated on more than 30 albums to date.
Bernie Taupin