Sarah Harding takes lead on new Girls Aloud single / Girls Aloud to release first song since 2012, solely with vocals by late Sarah Harding / Girls Aloud announce special tribute to Sarah Harding / Girls Aloud on public bullying, getting older and reuniting after the loss of Sarah Harding: 'I keep expecting her to burst into the room' / Cheryl sobs during Girls Aloud tribute to Sarah Harding in Dublin / Girls Aloud reunite for first time in 11 years on tour dedicated to late bandmate Sarah Harding / Girls Aloud begin first reunion in nine years with an emotional tribute to Sarah Harding / Girls Aloud announce UK and Ireland reunion tour dedicated to Sarah Harding / Girls Aloud to reunite for tour in memory of late Sarah Harding