A primary school teacher from North Yorkshire, who used spy cameras to secretly film young children as they undressed in shower cubicles, is tonight behind bars.
Simon Knowles, described by police as "sick and depraved" disguised mini cameras in a pen and even his tie to film the children - and then shared the images with others on the internet.
Tonight he's beginning a 4-and-a-half year jail sentence for a catalogue of sex offences. Jon Hill reports.
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