A report on ITV news http://www.itv.com/news/anglia/2015-11-04/parents-turn-paedophile-hunters-after-their-own-daughter-is-targeted/ begins
"Two self-styled 'paedophile hunters' from Bedfordshire who've already played a part in sending two men to jail say that they will continue to try and protect children. Neil and Katie Ivall from Dunstable started doing stings on potential paedophiles after their daughter was targeted online."
The report contains video of an interview with Neil and Katie.
Another article about Neil and Katie Ivall was published on the Mail Online on January 4th 2016
I believe that Neil is in the branch of the Ivall family descended from Thomas Ivall (1837-1908), a baker who lived in Chalvey, which is now a suburb of Slough.