The jury, of six men and six women, found John Larsen guilty on all five counts, with unanimous verdicts.
Judge Merfyn Hughes QC thanked the jury, telling them they had heard a "very unusual" case.
He told the court he is minded to sentence Larsen this afternoon, indicating that a long custodial sentence is likely.
He said these were "very, very serious offences" and the sentence he will pass will have to reflect that.
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Showers at times with a strong breeze. But there'll be plenty of dry weather with decent spells of sunshine.