In September 1940, the country was subjected to air attack from the enemy. The government needed to know the air raid patterns, types of bombs used and the resultant damage, particularly to the railway network, shipyards, important factories and public utilities. Therefore it instigated the bomb census survey to gather this information. 

At the start it only related to London, Liverpool and Birmingham but later it was extended to cover the whole country.

The country was divided into twelve civil defence regions with the responsibility of coordinating the information.

Eastern - Cambridge

London – usually split into London boroughs.

Midlands – Birmingham

Northern - Newcastle-upon-Tyne

North Eastern - Leeds

North Midlands - Nottingham

North Western - Manchester

Scotland - Edinburgh

South Eastern - Tunbridge Wells

Southern - Reading

South Western - Bristol

Wales - Cardiff

The content of the survey was very much dependent upon information gathered by the authorities. These included the police, air raid patrols, National Fire Service and locally based military personnel. These people recorded when, where and what types of bombs were dropped during an air raid; this information was then passed to the Ministry of Home Security who had an organisation set up for the purpose of recording such information. Each region had officers who then plotted the positions of where the bombs fell and the effect they had. It is these maps that we have access to today. The information was then distributed to various government departments and local authorities as well as to those with responsibility for civil defence.

Useful records

There are three useful sets of records held at The National Archives:

  • Air raid damage files - series HO192
  • Bomb census maps – series HO193
  • Bomb census reports – series HO198
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  • Some local archives hold records which were collated locally including incident maps, registers and ARP wardens’ logs. There are also various online resources about Second World War bombing.

Air raid damage files

Some of the more devastating air raid incidents were subject to a detailed investigation. There are around one thousand such reports for specific towns and London boroughs which provide the following information:

- detailed report on the effects of the bomb and the extent of damage caused

- analysis of the size and type of bomb

- building plans showing the bomb damage

- photographs.

Some files also detail the effects on industry, transport and public utilities. Occasionally there are reports of the interrogation of enemy personnel but these are not plentiful.

Bomb census maps

Bomb census maps exist for the whole of the London Civil Defence Region; there are fewer for other provincial towns and cities.

The maps provide a unique collection which were coloured by hand and reveal the extent of the destruction in detail. They are a valuable resource to family and local historians whose families were bombed out during the war.

They have also been invaluable for bomb disposal experts where unexploded bombs have been located. The colouring applied to the maps records a scale of damage and are the most detailed and complete survey of destruction caused by aerial bombardment.

The colour coding on the maps is as follows:

Black - total destruction

Purple - damaged beyond repair

Dark red - seriously damaged, doubtful if repairable

Light red - Seriously damaged, but repairable at cost

Orange - general blast damage, not structural

Yellow - blast damage, minor in nature.

The maps also illustrate where the impact points were for V-1 flying bombs and V-2 long-range rockets; these are depicted by either large or small circles.

Besides the damage shown by the above colours, there are areas shaded in light blue. These are the areas cleared by the War Debris and Demolition Service. On some maps, aqua is used. However, be aware that parks and open spaces were also coloured in pale green and lakes in pale blue so make sure you examine the maps closely in order to correctly interpret what they are showing.

Bomb census reports

The BC4 report forms forming part of the census are the most significant reports for research. They were compiled by the Research and Experiments Branch of the Ministry of Home Security. They need to be used in conjunction with the maps and provide the following information:

- date and time of the bombing

- type and size of the bomb

- whether the bomb exploded or not

- description of damage caused

- size of crater

- information about any air raid warnings

Casualty statistics are identified by a series of codes, namely K – killed, S/I seriously injured, L/I lightly injured. Names of casualties are not shown.

The census form often has a sketch map attached which shows the point of impact of the bomb and the surrounding road layout.

The census files are organised according to the type of bomb (the bombs are numbered in sequence), civil defence region and date of the air raid. For London they are further categorised between 1940 and 1942.

How to search bomb census records

A search for documents is not always straightforward. All the records are original documents and are not online so you will need to visit The National Archives. Planning your research should include the Discovery page on TNA website because it gives a description and the document reference. The best strategy for searching isusing keywords.

Enter one or more of the following keywords in the search fields.

  • - name of a town or London borough
  • - civil defence region
  • - map sheet number.
  • - topic - factory, shipyard etc.
  • - types of bomb dropped.
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You can also search by region (as shown above). This is useful if looking for air raid damage files.

Searching for ancestors who were casualties

For most family historians a search for an ancestor will be paramount. Because the census does not usually mention casualties by name, try searching the published volumes of Civilian War Dead 1939-1945, by the Commonwealth War Graves Commission. These records are organised by county and are available in the National Archives library. They include:

  • - full name of the casualty
  • - age
  • - names of parents and/or spouse
  • - when and where injured and died.
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Unfortunately, it was quite common that if someone was injured by bombing at their house or place of work, they would subsequently have died in hospital.

The Commonwealth War Graves Commission website also has a section for civilian war dead.

Auxiliary and National Fire Service and Air Raid Wardens

Many of our ancestors would have been involved in the civilian services in World War two. For the first couple of years firefighting was undertaken by locally run Auxiliary Fire Services. In 1941 these local services became part of the National Fire Service.

In most instances the personnel records for both the National Fire Service and the Air Raid Wardens have not survived but you may well find memorabilia and records of service within your family archive. Some records may well be held locally together with administrative papers; the National Archives also holds collections of central government policy files which may occasionally mention names.

Air Raid Precautions had existed well before the begnning of World War Two but obviously the numbers of personnel increased dramatically when the war started. The ARP wardens had several responsibilities and they worked closely with the civil defence units and the fire service. These duties included:

  • -maintaining and policing the blackout
  • - issuing gas masks
  • - air raid shelters
  • - helping to record the bomb damage
  • - rescue of casualties.

The Key Points Intelligence Directorate

Key points were the strategic targets including factories, public utilities, service establishments and buildings of national importance. The directorate maintained and distributed information about bomb attacks and damage sustained by such establishments to help improve defence measures. The reports were issued on a regular basis sometimes daily. Surviving records are at The National Archives within series HO201.

Locally held records

The London Metropolitan Archives holds records for London and many borough archives hold records of local events and maps. In the provinces local archives may well hold information about events occurring in their area of operation. Many hold photographs and rough maps as well as individual diaries and notebooks kept by people who were members of the civil defence force, fire services and air raid wardens.

The Imperial War Museum holds a good archive of personal papers and oral reminiscences as well as photographs of air raid damage. Most tend to relate to the London area which of course suffered extensive damage in the Blitz.

This article was contributed by Ian Waller from Family History Federation.
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