Firefighters are being delayed in getting to emergencies because of a computerised dispatching system which regularly crashes and often fails to send the closest fire engine. The system, which is called VISION DS and supplied by the technology company Capita, is used by the UK's busiest fire brigade - London Fire Service, as well as brigades in the South West - Dorset and Wiltshire Fire and Rescue, Devon and Somerset and Hampshire Fire and Rescue Service. Responding to a Freedom of Information request, London Fire Service has told 5 live Investigates that the system crashed 7 times in 2016 and they logged 195 separate problems. In the South West the system crashed 10 times in 2016 and - in some cases - it was down for several hours. One control room operator has told the programme that when the system has gone down, staff have resorted to using AtoZ maps to identify the nearest fire station to an incident.The system failures are putting lives at risk according to the Fire Brigades Union. No deaths are known to be attributable to the system. Capita says there have been 'very occasional problems.' London Fire Brigade says all the issues raised are being dealt with by the Brigade and Capita.