They were first revealed on BBC Radio 1 on 1 January 1990, with the "Top 80 of the 80s" counted down and played between 12:35 p.m. The best-selling singles of the 1980s were compiled for Gallup by chart statisticians Alan Jones and Bob Macdonald. Under the BMRB this sales data was posted to the chart compilers, but when Gallup took over they automated the system by installing computer terminals in the shops that registered each sale and sent the information to Gallup immediately. The "panel sales" data from each shop were sent to the chart compilers were week and a multiplication factor was then applied to obtain an estimate of total sales across the country. The charts were produced from the sales data of a representative panel of around 500 record shops across the country.
On 8 January 1983 Gallup took over the compilation of the UK music charts and continued to provide the chart data for the next eleven years. For the first three years of the 1980s the UK Singles Chart was compiled by the British Market Research Bureau (BMRB) who had been compiling the charts throughout the 1970s. Singles are a type of music release that typically have fewer tracks than an extended play or an album.
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