Once upon a time, managers who wanted progress reports on construction sites would simply walk around the site and look at where things were at.

This is not the case, however, with London’s massive Crossrail project, where unmanned aerial vehicles (UAVs) or drones are being used to support activities such as site inspections, health and safety inductions, inspections of crane or scaffolding erection and hazard and safety identification. When a BBC team wanted to give…