The system will use satellite technology to show the whereabouts of each van to within two metres, making it possible to send the nearest driver to any given location.

The Automated Vehicle Location (AVL) system is being installed to increase productivity and shorten journey times. It will also feature an alarm button, allowing staff to call for help in an emergency.

The project has been awarded to AVL specialists DigiCore. The deal is thought to be the biggest of its type in the water industry and among the largest of any business sector.

The new technology, which should be installed by the end of August, will show the position of all vehicles on an electronic map. Carl Leadbeater, Thames Water’s operations manager, said: ‘Until now, we have been able to monitor separate teams rather than our whole workforce – so this new technology will be a big step forward.’