| Description | Emergency call-out arrangements, returns from control centres and report centres, air raid warnings, changes in district boundaries, Home Security circular No. 170/1940 - Alterations to the air raid warning system. List of factories receiving direct air raid warnings, Eastern region circular 83/1943 - Responsibility for the sounding of hand-bells to indicate the all-clear. Air raid warnings to Hinchingbrooke Hospital. (NB: Hinchingbrooke Castle was then a Red Cross convalescent home for bomb casualties from London.) |