Barri White, who was wrongly jailed for Rachel Manning's murder, said that he was "over the moon" that Shahidul Ahmed had been convicted of her murder.
He added adding that "justice has finally been done" and that he was "really happy that Rachel's family have finally got justice and the closure they deserve".
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Police carried out a "proactive" operation after receiving reports that other concerts by the band had seen lots of mobile phone thefts.
The child died on her injuries and another 14-year-old girl was injured after the buggy they were travelling in was involved in a car crash.
Cloud thickening from the west throughout the day. Rain in northwest later.