Along with other members Mike Nolan, Cheryl Baker and Jay Aston the group went on to win the contest and on 4 April 1981 took part in the Eurovision Song Contest representing the United Kingdom.
"Knock, Knock Who's There?", written and composed by John Carter and Geoff Stephens, produced by Mickie Most, was the United Kingdom's entry at the Eurovision Song Contest 1970, performed by the Welsh singer Mary Hopkin.
Cliff Richard had also previously represented the United Kingdom in 1968 with "Congratulations", which came second.
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Three artists returned to the 1973 contest, Finland's Marion Rung, who last represented the nation in 1962; 1971 entrant Massimo Ranieri from Italy; and Cliff Richard, who last performed Congratulations for the United Kingdom in 1968.