Until 1992 the UK had a network of over 7000 fixed warning sirens as part of the HANDEL network. These were removed because (according to Wikipedia) the threat subsided and their efficiency is limited by double glazed windows.
The new attack warning system has also now been relegated - partly due to the change in our communication methods and partly because the system was always "analogue" (I am unsure how it therefore has any value in warning today).
Many of the old warning sirens are used in flood warning and some may simply have not been removed. One of the key questions often asked is "where were the old sirens located?". It would appear there is no central list and so this website is aiming to build up a picture of where they are and were.
To wet your appetite - here is a flood warning siren from Hebden Bridge. Note the green box at the foot of it which connects it to the BT network.comments powered by Disqus