question: which british artist wrote a christmas song that is featured on the Top ten Christmas singles and has sold 30 million albums worldwide?
answer: Chris Rea
context: Title: Bachman–Turner Overdrive
  Passage: Bachman–Turner Overdrive, often abbreviated as BTO, is a Canadian rock group from Winnipeg, Manitoba, that had a series of hit albums and singles in the 1970s, selling over 7 million albums in that decade alone.  Their 1970s catalogue included five Top 40 albums and six US Top 40 singles (ten in Canada).  The band has sold nearly 30 million albums worldwide, and has fans affectionately known as "gearheads" (derived from the band's gear-shaped logo).  Many of their songs, including "Let It Ride," "You Ain't Seen Nothing Yet," "Takin' Care of Business," "Hey You" and "Roll on Down the Highway," still receive play on classic-rock stations.
  Title: Chris Rea
  Passage: Christopher Anton Rea ( ; born 4 March 1951) is an English singer-songwriter and guitarist, recognisable for his distinctive, husky voice and slide guitar playing.  The "British Hit Singles & Albums" stated that Rea was "one of the most popular UK singer-songwriters of the late 1980s.  He was already a major European star by the time he finally cracked the UK Top 10 with his 18th chart entry; "The Road to Hell (Part 2)".  As of 2009, he has sold more than 30 million albums worldwide.
  Title: Driving Home for Christmas
  Passage: "Driving Home for Christmas" is a popular single written by Chris Rea and released in 1986.  The song peaked at #53 in the UK Single Chart in 1988, and re-entered the chart in 2007, peaking at #33.  It reached a brand new peak of #26 in 2016.  Although it had modest charting, the single has a brief chart appearance every year in the Top 40, and is featured among the Top 10 Christmas singles.
citations: Driving Home for Christmas Chris Rea