But then, four years ago, he was astonished to find himself embroiled in Operation Ore, the UK's largest ever police hunt against internet paedophiles. He was arrested on suspicion of possession of indecent images of children, downloading indecent images of children and incitement to distribute indecent images of children.
Hampshire Police took away his computer and data storage devices including flash drives, CDs and floppy disks, as well as examining the computer and storage devices that he used at work.
The effect was devastating. When his employers became aware of the reason he had been arrested, he was abruptly dismissed from his £120,000 a year job, and close members of his family disowned him.
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But the police's computer technicians take several months to examine these, and Mr Bunce could not afford to wait to repair the damage done to his reputation. "I knew there'd been a fundamental mistake made and so I had to investigate it."