Perhaps that was a silly question Barry 'cos when I was about three or four it was the air raid siren for us. We'd have to get under the dining room table.
We couldn't go down the shelter because it was full of water. The water table in Cranham, Essex was about two feet down and there was no waterproofing available for the concrete in those days.
Dad used to soak his dart board in the shelter, very proud of his solid elm dartboard was Dad. He was an air raid warden (unfit for the army) and when he was on duty on quiet nights the wardens used to play darts in their hut.
During the day he worked at the docks, kinda like being on the front lines, 'cos the mammoth crane in the river was a prime Luftwaffe target. They used to curse that bloody thing every time there was a daylight raid.