Top Pops chart
... that the Top Pops chart, which ran for less than three years, had 15 number-one singles that failed to top the official UK Singles Chart?
... that the <b id="mwDnc"><a href="./List_of_Top_Pops_number-one_singles" id="mwDng" rel="mw:WikiLink" title="List of Top Pops number-one singles"><i id="mwDnk">Top Pops</i> chart</a></b>, which ran for less than three years, had 15 number-one singles that failed to top the official <a href="./UK_Singles_Chart" id="mwDno" rel="mw:WikiLink" title="UK Singles Chart">UK Singles Chart</a>?