There's been a number of fake (claimed to be original) ARP plaques and door signs on the market for a number of years. The more common ones are the circular and rectangular ARP Warden plaques surmounted by a crown. They are very light compared to the originals. The below fake has been posted on eBay several times. The giveaway here is that someone didn't do their research. There is no such thing as an "Air Raid Warden Post"... there's an "Air Raid Wardens' Post". There was always more than one person at a post. Also, back in the day, grammar and punctuation was much more stringently followed. If you find a sign with the missing apostrophe chances are it's a fake/reproduction. Stating something is a repro is fine, but calling the below 'original' is simply lying.
A very scarce enamel sign is currently up on eBay. I've not seen this wording on a sign before and I imagine that it'll go for a packet.
A nice piece of memorabilia from WW2. An 'Air Raid Warden' sign used outside the home of a warden in St Mary Cray, south east London.
This ARP Air Raid Warden enamel door plaque (currently on auction on eBay) is in fantastic condition. Many thousands of similar door plaques, in various designs, were manufactured both before and during the war.
Clearly understanding the and reacting to the siren could save your life. Many businesses put up signs - such as the one below - to educate their workers about the new air raid sirens.
A couple of nice items from Beckenham in south east London. An enamel wardens' post sign and an original local area marking for the bluette overalls.
An erly war photograph showing Doris Waddington wearing a warden's helmet outside a wardens' post. The interesting aspect is the large "ARP WARDEN" sign affixed to the wall.
The German butterfly bomb was a small 2 kg anti-personnel device capable of killing or causing serious injury. The early cluster bomb was used extensively on the Eastern Front but thankfully only a relatively small number were dropped on British towns and cities in East Anglia and the North West.
More information about butterfly bombs
Preparations for the likely bombing of military installations, industrial facilities and civilian populations led to the creation of many thousands of temporary and permanent air raid shelters. For people caught outside when the siren sounded they were guided to the nearest shelter by the ubiquitous 'Shelter' signs. These would often convey the distance to the shelter in yards and also sometimes the number of people the shelter could accommodate. There were obviously many hundreds of thousands of these enamel signs manufactured. Some are double sided so they could be used from any direction. Following the war many would stay in situ for many years and others were removed and thrown away. Those that remain are highly collectable and can reach many hundreds of pounds at auction.
During the second world war dozens of different designs for ARP signs were created. This is a high quality chromium plated version. Most were for positioning on doors and some for ARP posts. They are highly sought after collectables and often faked these days.
News about interesting insignia, ARP related info and period photos that turn up.