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The charity also reminded anyone with concerns about the welfare of a child to contact its helpline on 0808 800 5000.
ITV News Correspondent Ben Chapman has tweeted:
Former Lostprophets singer Ian Watkins has been refused permission to appeal his 35-year sentence on child sex charges.
Court of Appeal judges sitting at Cardiff Crown Court said they would not grant leave for appeal.
One of Watkins' two female accomplices also had her appeal bid turned down.
Former Lostprophets singer and convicted paedophile Ian Watkins is seeking leave to appeal against the length of his jail sentence.
Last year, Watkins was sentenced to 35 years - 29 to be served in prison and a further six years on licence - for a series of child sex offences.