Channel 4's award-winning The Secret Life of 5 Year Olds returns for a one-off special taking eight of the much-loved cast and their families for an adventure abroad in Turkey. A cast of four girls and four boys including Jack, Harper, Iris and Sienna have dusted off their bucket and spade for some fun in the autumn sun. Child development experts Dr Elizabeth Kilbey and Prof Paul Howard-Jones watch the children's foreign forays unfold and offer insight into their behaviour. At a time when the UK's children have less freedom and more structure, how will these five and six-year-olds behave when they're away from their usual routines? Jack is a thoughtful boy but struggles to be impulsive. So what does he do when he's faced with an opportunity that is enticing but also daring?