July 2019 Potters Bar man sentenced to more than nine years for historic child sex abuse A Potters Bar man has been sentenced to nine years and four months in prison for historic sexual offences against children. David Bigg, of Shillitoe Avenue in Potters Bar, was a St John Ambulance cadet leader in the 1960s and 1980s when he committed the crimes against two children. Bigg’s first victim was between 11 and 14 and his second between 11 and 15. On July 3, St Albans Crown Court heard the assaults were committed over a sustained period when the teenagers were cadets in Bigg’s care, often when they were together alone and being escorted back from meetings. The now-72-year-old would perform sexual acts on himself in front of the first victim and force the second victim to engage in sexual acts with him. This all came to light in 2015 and 2018 respectively, when the victims reported the abuse to police officers.