A FORMER Scout leader was yesterday convicted of historic sex abuse against two young boys more than 30 years ago.

William Quigg, 77, of Lintwhite Court, Bridge of Weir, was found guilty of abusing the two boys from when they were aged 12 and 13.

The offences took place between 1980 and 1986 at various addresses in Glasgow.

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Quigg, a former Scout Commissioner, admitted sexually abusing one boy when he was aged between 12 and 15 but denied raping the other boy and sexually abusing him from the age of 12 to 16.

Neither of the boys were Scouts.

A jury at the High Court in Glasgow convicted Quigg of all the abuse.

Judge Lord Burns remanded the first offender in custody and placed him on the Sex Offenders' Register.

Quigg showed no emotion as he was led away to the cells.

The boy who was raped described Quigg as “a voracious predatory paedophile."

“This man was clearly beyond cruel," added the victim, who is now 48.

"He knew I was very vulnerable and targeted me because of that. He knew there was nothing I could do.”

The man also told the jury he met with Quigg after the rape.

He added: "I thought he was maybe going to say sorry. Instead, he was very aggressive and said if I told anyone about the abuse, he would say I had assaulted his mother.”

The man claimed that, after he complained about being constipated, he was raped in a shower room.

He told the jury that when he tried to fight back, Quigg told him: “Shut up, don't say anything.”

The victim added: “I just couldn't believe what had happened. I was just astounded.”

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He told the court: “I have complex post-traumatic stress.”

The victim told prosecutor Kath Harper that he first reported Quigg in 2009 but there were no court proceedings at that time.

Lord Burns called the case “distressing” and will sentence Quigg at the High Court in Livingston next month.

Defence counsel Euan Dow will give his plea in mitigation then.