Computer says no: The predictive algorithms that are changing lives

Predictive algorithms, where computers crunch statistics to advise on possible futures, are increasingly commonplace in UK councils and police forces. They're being used for everything from traffic management to benefits sanctions. Critics say it's unclear how extensively our data is being used.Sky's technology correspondent Rowland Manthorpe meets those who are predicting our futures, and the people who've found their lives have been changed by computer models.