Abba legends BENNY ANDERSSON and BJORN ULVAEUS have reportedly agreed to guest judge for music mogul Simon Cowell's UK talent show The X Factor. The Swedish songwriters have been invited by the American Idol judge to appear towards the end of the ITV series next month (NOV06). An insider tells British newspaper Daily Star, "This is a major coup for us. To get the guys who wrote ABBA's hits to be involved in our show is just amazing."