number-one singles
... that The Hollies had seven number-one singles on Wonderful Radio London's Fab 40 chart, six of which failed to top the UK Singles Chart in the 1960s?
... that <a href="./The_Hollies" id="mwDMY" rel="mw:WikiLink" title="The Hollies">The Hollies</a> had seven <b id="mwDMc"><a href="./List_of_Fab_40_number-one_singles" id="mwDMg" rel="mw:WikiLink" title="List of Fab 40 number-one singles">number-one singles</a></b> on <a href="./Wonderful_Radio_London" id="mwDMk" rel="mw:WikiLink" title="Wonderful Radio London">Wonderful Radio London</a>'s <a href="./Fab_40" id="mwDMo" rel="mw:WikiLink" title="Fab 40">Fab 40</a> chart, six of which failed to top the <a class="mw-redirect" href="./List_of_number-one_singles_from_the_1960s_(UK)" id="mwDMs" rel="mw:WikiLink" title="List of number-one singles from the 1960s (UK)">UK Singles Chart in the 1960s</a>?