Secret Nuclear Bunker, which have now been converted into museums. Post-Cold War With the Cold War having ended, the BBC and British Telecom developed the National Attack Warning System in 2003. This system was able to warn by television, radio and telephone (the latter only in some areas) of an impending attack using existing infrastructure. The BBC was capable of doing so within ten minutes using their existing broadcasting procedures. By the time of the 2011 digital switchover, this was becoming obsolete because television and radio have limited warning capability. According to a report in the Daily Telegraph, there were suggestions that the warning message would be recorded by Jill Dando, actress Joanna Lumley or Carol Vorderman. Under the Broadcasting Act 1980, the government still has the legal right to take over editorial control of radio and television in the event of a national emergency. Also, the BBC agreement allows the government to ask the BBC to broadcast messages in an emergency: Operation The decision to activate the service would have been taken at Cabinet level late in the crisis phase. On being given the order, the BBC and ITV were to suspend normal programming, broadcast the frequencies for the Wartime Broadcasting Service and go off-air an hour later (with television used only to broadcast Protect and Survive public information films and unavailable after an attack due to its susceptibility to electromagnetic pulse). At this point, one single national programme would have been broadcast on BBC Radio 4 from Wood Norton. This would have consisted of official government announcements and information interspersed with filler material, such as music, news and warnings. The four-minute warning itself was to have been injected from a special studio at Broadcasting House and been broadcast nationally on all television and radio stations when a coded signal from RAF High Wycombe was given. This studio would also have been used by government ministers to broadcast messages and announcements until the government left London late in the crisis phase (or during the precautionary period). After an attack, there would also have been a regional service tailored to local needs located in regional seats of government. Regional controllers were to use these smaller BBC studios to give out local messages to communities and would have been manned by BBC staff. If conventional air attacks destroyed peacetime broadcasting facilities, the Wartime Broadcasting Service would also have been activated. Regular