broadcasts for the purpose of alerting the general public and has legal power to take over editorial control of the BBC during a national emergency under the BBC Charter and the Broadcasting Act 1980. The national siren system was largely dismantled during the 1990s. The British Government cited the increasing use of double-glazed windows (which make sirens harder to hear) and the reduced likelihood of air attack as reasons to eliminate the system in most parts of the country. Some coastal and river areas have retained and regularly test the sirens as part of the flood warning defences. Since 1952, Broadmoor Hospital has employed a network of 14 sirens to warn of escaped patients; this is tested every Monday at 10 am. The hospital sirens were scheduled for removal during 2018 except for one located in the hospital grounds. Carstairs Hospital also retains its sirens, which are tested monthly. In some towns, sirens were once used to summon part-time firemen until the introduction of radio pagers during the 1970s – these 'stand alone' sirens operated independently of the warning network. Torness nuclear power station in East Lothian Scotland uses two of these sirens as a warning of an off site nuclear emergency, tested every Tuesday morning at 10 am. Sample script The following is a script that would have been broadcast in the aftermath of an attack, available from the BBC: Cultural impact The Cold War and the fear of nuclear attack permeated pop culture up until the 1990s. Examples include the song "Four Minute Warning" by the British punk band Chaos UK (EP "Burning Britain", 1982), the poem "Your Attention Please" by Peter Porter, a solo song by Take That singer, Mark Owen, and "Four Minutes" by Roger Waters (of Pink Floyd fame) on his 1987 solo album Radio K.A.O.S.. John Paul Jones has a song entitled "4-Minute Warning" on the 1988 Brian Eno album Music for Films III. The first single of the UK rap crew Gunshot, from 1990, was entitled "Battle Creek Brawl (4 Minute Warning)". A Radiohead track from the 2007 Bonus Disc album In Rainbows Disk 2 is titled "4 Minute Warning". The four-minute warning was a central plot and narrative device in dramas (both on stage and screen) and novels, often being the motor force of plays, films, novels and cartoon strips. The BBC drama Threads, about how society decays after a nuclear holocaust,