Until 1 February 1994, the chart was compiled each week by Gallup – after this date, it was managed by Millward Brown, who expanded the number of sales figures sampled, and extended the use of electronic point of sale machines.
[1] From July 1998 onwards, compilation of the chart was overseen by the Chart Information Network, jointly operated by the British Phonographic Industry (BPI) and the British Association of Record Dealers.
[7] The first number-one album of the 1990s was ...But Seriously by Phil Collins[8] – released in 1989, ...But Seriously first reached number one in December of that year, and remained at the top for eight weeks.
[3] The Spice Girls' record label, Virgin Records, was the most successful label of the decade – with an artist roster that included the Spice Girls, Phil Collins and Meat Loaf, Virgin topped the albums chart with 19 different albums for a total of 62 weeks.
Typically, this will refer to the album that was announced as number one on the Sunday before 25 December—when Christmas Day falls on a Sunday itself, the official number one is considered by the OCC to be the one announced on that day's chart.