[1][2] The chart was based entirely on sales of physical singles from retail outlets and announced on Tuesday until October 1987, when the Top 40 was revealed each Sunday, due to the new automated process.
by Band Aid, selling over 3.5 million copies, and passing "Mull of Kintyre" by Wings to become the best-selling single ever.
Minogue would have reached number one if sales from cassette singles were included but they were sold for £1.99 – cheaper than was allowed at the time.
Following the debacle the British Phonographic Industry reduced the minimum price for cassette singles to become eligible towards sales figures.
She had six number ones: "Into the Groove" (1985); "Papa Don't Preach", "True Blue" (both 1986); "La Isla Bonita", "Who's That Girl" (both 1987); and "Like a Prayer" (1989).
He had two number-one singles as a solo artist, four as a member of pop duo Wham!, and one as a duet with Aretha Franklin.
The British Phonographic Industry classified singles and albums since 1973 by the number of units sold, with the highest threshold being a "platinum record".
[32][33] In the 1980s, twelve songs were released that were classified platinum in the decade; eleven of these also sold one million units in that time.
[10][32] Twelve other songs originally released in the 1980s have since sold one million units, eleven of them following the introduction of music downloads in 2004.
New Order's label, Factory Records, were not a member of the British Phonographic Industry (BPI) so they never received any sales certifications.