The ENGO charging station uses kinetic tiles and solar panels to charge up to 14 smartphones at a time, and provides free WiFi access and an emergency phone.

Smartphones hold increasing amounts of sensitive personal data, so every device is now a mixed-use device. As a result, businesses must protect employee privacy as fiercely as corporate security.

Madonna has banned the use of mobiles and smart watches at her 14-night London Palladium (top right) residency as part of her Madame X world tour.