The UK Singles Chart is a record chart compiled on behalf of the British record industry. 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. From July 1998 onwards, compilation of the chart was overseen by The Chart Information Network (CIN) and it was based entirely on sales of physical singles from retail outlets – airplay statistics are not used in compiling the official UK Singles Chart. The chart week ran from Sunday to Saturday, and the Top 40 was first revealed on BBC Radio 1 on a Sunday. Record companies began making singles available to radio stations much further in advance of their release dates and makin