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Abba's Björn Ulvaeus says a public reunion tour or concert would be "impossible" for the band.

Speaking to 5 live's Sarah Brett at the the new Mamma Mia restaurant in Stockholm - where the group reunited briefly on stage at its launch in January - Björn said the foursome would not be signing in public any time soon.

However, he did reveal a time when they had sung together recently.

This clip was originally broadcast on 5 live's Afternoon Edition on Thursday 12 May 2016.