...deploy a force-wide mobile data system. Up to 3,500 police officers will use mobile devices connected through AirwaveMobile Applications Gateway Service and the national secure Airwave Tetra digital communications network. www.computerweekly...
http://www.computerweekly.com/Articles/2006/12/15/220743/news-in-brief.htm
...to connect them to the outside world." The UK has 54,251 base stations, and the emergency services use the Airwavemobile service, which is run on O2's network. "O2 provides back-up generators for all its call-switching centres...
http://www.techworld.com/news/index.cfm?RSS&NewsID=11676
Under the 10-year deal, O2 Airwave and SunGard Vivista will supply radio terminals to ambulance staff and integrated communications control systems for the three control rooms. They will equip the ambulances and Patient Transport Service vehicles with Tetra radios.
http://networks.silicon.com/mobile/0,39024870,39160515,00.htm?r=1