How many towns in the new millennium can honestly say that an air raid siren goes off every seven days? Newton Aycliffe can. At 10.45am every Thursday morning, the INEOS factory on the town's industrial estate tests its hazard alarm, which happens to be an old air raid style siren. That means if you work night-shifts you are abruptly woken up by it, while newcomers to the town can quite easily think they're under attack.