A parent who volunteered to be part of ITV Daybreak's investigation into what children would do if approached by a stranger said the results were a "rude awakening".
Natasha said she had not slept for two weeks since the experiment and has been much more vigilant.
More top news
A team of detectives and specialists is set to begin a painstaking excavation of the area where Ben is thought to have gone missing in 1991.
The foreign secretary's suggestion last week's bombing of an aid convoy might constitute a war crime prompted an angry response from Moscow.
Goals from Charlie Austin, Dusan Tadic and James Ward-Prowse consigned Slaven Bilic's men to their fourth straight Premier League loss.