Benny Andersson has said he doesn't think Abba have "anything to prove" with their new material. The band announced last week they have recorded two new songs, which will be released later this year.

Abba's two leading men made a surprise appearance as hit musical Mamma Mia! celebrated its 20th anniversary in London's West End. Huge applause welcomed Benny Andersson and Bjorn Ulvaeus onto the ...