Here is an interesting short film from British Pathé about identifying and staying away from German butterfly bombs. These antipersonnel bombs could have caused immense havoc but thankfully only a limited number were dropped. Ministry of Information public safety trailer about antipersonnel bombs (butterfly bombs)
This is an interesting article on The Gurdian recalling the impact of a raid on Grisby and Cleethorpes in 1943 when numerous butterfly bombs were dropped. Remembering the terror the Luftwaffe's butterfly bombs brought to the North
News about interesting insignia, ARP related info and period photos that turn up.