ABBA's Bjorn and Anni-Frid talk about their lasting success

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One of Eurovision's most successful acts is celebrating the 40th anniversary of winning the song contest. We're talking about ABBA! One half of the group turned out for an ABBA extravaganza on London's South Bank to celebrate the occasion. Bjorn Ulvaeus and Anni-Frid Lyngstad made their way on stage to a chorus of Happy Birthday. Their hit Waterloo won the big prize in Brighton back in 1974. Report by Claire Lomas.

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