A former tutor labelled a "predatory paedophile" by detectives has been handed a indeterminate prison sentence after she admitted sexually abusing young children.
Carol Clarke, 46, assaulted children she followed into toilets in Grimsby and other parts of Lincolnshire, she told detectives.
Grimsby Crown Court heard she was sexually aroused by watching young children urinate and from seeing them looking distressed when they needed to go to the toilet.
Sentencing Clarke, Judge David Tremberg told her she would have to serve a minimum of four years in prison.
Judge Tremberg told Clarke, of Cromwell Road, Grimsby, Lincolnshire, she would only be released from prison once parole board members were satisfied she no longer posed a risk to young children or the public.
He told Clarke, who sat motionless while being sentenced: "This is a sad and deeply troubling case.
"From the time you were a very young woman you have had and maintained a very worrying sexual preference, in particular young girls when they are urinating and when they are distressed."
He told Clarke, who won a place at Cambridge University after she had completed her sixth form exams, she was "clearly an intelligent woman" and could have endeavoured not to indulge her interest in children.
At an earlier hearing Clarke admitted abusing young boys and girls, with some of her offences dating back to before 1992.
Gordon Stables, prosecuting, said the case had been brought based on the confessions of Clarke, after she was reported to police earlier this year by a mental health care worker. He told the court Clarke had confessed over a period of two decades, to various health care professionals, to offences she committed on children ranging from as high as 100 to as low as 10.
