# British shadow factories

British shadow factories were the outcome of the Shadow Scheme, a plan devised in 1935 and developed by the British government in the buildup to World War II to try to meet the urgent need for more aircraft using technology transfer from the motor industry to implement additional manufacturing capacity.
The term 'shadow' was not intended to mean secrecy, but rather the protected environment they would receive by being staffed by all levels of skilled motor industry people alongside (in the shadow of) their own similar motor industry operations.
A directorate of Aeronautical Production was formed in March 1936 with responsibility for the manufacture of airframes as well as engines, associated equipment and armaments. The project was headed by Herbert Austin and developed by the Air Ministry under the internal project name of the Shadow Scheme. Sir Kingsley Wood took responsibility for the scheme in May 1938, on his appointment as Secretary of State for Air in place of Lord Swinton.
Many more factories were built as part of the dispersal scheme designed to reduce the risk of a total collapse of production if what would otherwise be a major facility were bombed, though these were not shadow factories.

## Purpose and use

It was impossible for these facilities to be secret, though they were camouflaged after hostilities began. They were war materiel production facilities built in "the shadow" of motor industry plants to facilitate technology transfer to aircraft construction and run, for a substantial management fee, in parallel under direct control of the motor industry business along with distributed facilities. General Erhard Milch, chief administrator of the Luftwaffe, was in Britain in the autumn of 1937 inspecting new shadow factories in Birmingham and Coventry, RAF aeroplanes and airfields.

### Background

Up until the middle of 1938, the Air Ministry had been headed by Lord Swinton. He had been forced by Prime Minister Neville Chamberlain to resign his position due to a lack of progress in re-arming the Royal Air Force, the result of obstruction by William Morris, Lord Nuffield. Swinton's civil servants approached their new boss, Sir Kingsley Wood, and showed him a series of informal questions that they had asked since 1935 on the subject, such as those posed to Morris Motors with regard to aircraft engine production capability at its Cowley plant in Oxford. As it turned out, the specialised high-output engines required by the RAF were made by Armstrong Siddeley, Bristol Aeroplane, Napier & Son and Rolls-Royce, all of which employed a high number of sub-contractors. Despite their new factories, protestations by Wolseley Aero Engines (Nuffield) and Alvis were ignored. Their products were not required. Engines were specified primarily by the designers of aircraft though the Air Ministry did sometimes specify the engine to be used. Nuffield did participate after Wood's appointment, providing the Castle Bromwich Factory and promising a thousand Spitfires by June 1940 but, after two years, management was so poor that when June 1940 arrived not one Spitfire had been produced there. Castle Bromwich was withdrawn from Nuffield by Lord Beaverbrook. the Minister of Aircraft Production, and placed under the wing of Vickers-Supermarine.

### Implementation

The plan had two parts:
* Development of nine new factories. The government would build and equip the factories. Motor car companies would be asked to gain experience in the making of engine parts so, if war broke out, the new factories could immediately go into full production.
* Extensions to existing factory complexes to allow either easier switching to aircraft industry capability, or production capacity expansion.
Under the plan, there was government funding for the building of these new production facilities, in the form of grants and loans. Key to the plan were the products and plans of Rolls-Royce, whose Merlin engine powered many of the key aircraft being developed by the Air Ministry, as well as Bristol Hercules radial engine. Bristol Aeroplane would not allow shadow factories to build complete engines, only components. The exception was Austin.
The first motor manufacturers chosen for engine shadows were: Austin, Daimler, Humber (Rootes Securities), Singer, Standard, Rover and Wolseley. In the event Lord Nuffield took Wolseley out of the arrangement and Singer proved to be in serious financial difficulty.

#### The buildings

Wood handed the overall project implementation to the Directorate of Air Ministry Factories, appointing Herbert Austin to lead the initiative (most of the facilities to be developed were alongside existing motor vehicle factories), and the technical liaison with the aircraft industry to Charles Bruce-Gardner. He also handed the delivery of the key new factory in Castle Bromwich, that was contracted to deliver 1,000 new Supermarine Spitfires to the RAF by the end of 1940, to Lord Nuffield, though in May 1940 the responsibility had to be taken from Nuffield and given to Vickers.
The buildings were sheds up to 2,000 feet (610 m) long lit either by glazed roofs or "north-lit". Office accommodation was brick, and wherever possible faced a main road. These buildings were extremely adaptable and would remain part of the British industrial landscape for more than 50 years. One of the largest was Austin's Cofton Hackett, beside their Longbridge plant, started in August 1936. 1,530 feet (470 m) long and 410 feet (120 m) wide, the structure covered 20 acres (81,000 m$^2$). Later a 15 acres (61,000 m$^2$) airframe factory was added, then a flight shed 500 feet (150 m) by 190 feet (58 m) was attached to the airframe factory.
The new factory buildings were models of efficient factory layout. They had wide, clear gangways and good lighting, and they were free of shafting and belt drives. The five shadow factories in Coventry were all in production by the end of October 1937 and they were all making parts of the Bristol Mercury engine. By January 1938 two of those shadow factories were producing complete airframes. In July 1938 the first bomber completely built in a shadow factory (Austin's) was flown in front of Sir Kingsley Wood, Secretary of State for Air. It was said eight shadow factories constructing aircraft components were in production in or near Coventry in February 1940.
As the scheme progressed, and after the death of Austin in 1941, the Directorate of Air Ministry Factories, under the auspices of the Ministry of Aircraft Production (MAP), gradually took charge of the construction of the buildings required for aircraft production. In early 1943 the functions of the directorate of Air Ministry Factories were transferred to the Ministry of Works.

##### Scotland

There were three waves of construction of shadow factories and only the third and smallest reached Scotland in the shape of the factory at Hillington producing Rolls-Royce's Merlin engines. Ferranti's factory in Crewe Toll, Edinburgh will have been secret.

##### Empire

Similar plans were introduced in Canada, Australia, New Zealand and South Africa.

## List of shadow factories

| Location | Manager for Ministry of Aircraft Production | Original use | Wartime production | Today |
| Acocks Green, south of Birmingham | Rover Aero | Westwood family's market garden | Parts for Bristol Hercules radial engine | Redeveloped as housing |
| Bankfield Shed, Barnoldswick | Rover Aero | Weaving shed | Jet engine development | Handed over to Rolls-Royce in 1943 |
| Banner Lane, Coventry | Standard Aero No. 2 | Golf course | Bristol Hercules radial engines | Ferguson then Massey Ferguson tractors. Closed 2002. Now housing |
| Garden Street Mill, Blackburn | J. E. Baxter and Co | Cotton mill | Gas masks | Newman's Footwear, now demolished. |
| Blythe Bridge, Staffordshire | Rootes Securities | | Blenheim, Beaufort, Beaufighter | Indesit cookers |
| Lostock, Bolton, Lancashire | de Havilland | | Airscrews | |
| Browns Lane, Coventry | Daimler | Farmland | Aero engines, Aircraft sub-assemblies | Jaguar's Browns Lane plant, demolished 2008, now housing and an industrial estate |
| Burtonwood, Warrington | Fairey Aviation | | Assembled and modified imported American aircraft | |
| Canley-Fletchamstead Hy, Coventry | Standard Aero No. 1 | Vacant land on Standard's Canley site | Bristol Beaufighter de Havilland Mosquito | Standard Motor Company demolished after closure in 1980. Now housing |
| Canley-Fletchamstead Hy, Coventry | H M Hobson | Vacant land on Standard's Canley site | Carburettors for aircraft engines | Standard Motor Company demolished after closure in 1980. Now housing |
| Castle Bromwich, West Midlands | Nuffield Organization then Vickers | Farm/Sewage works | 11,989 Supermarine Spitfires, Avro Lancaster | Dunlop Research Centre, Fisher & Ludlow — Pressed Steel, Jaguar |
| Caversham (Star Road), Berkshire | Unknown | Purpose-built factory | Spitfire fuselages and engines | Housing |
| Christchurch, Hampshire | Airspeed | | Airspeed Oxford | Mixed retail units |
| Clayton-le-Moors, Accrington | Bristol Aeroplane Company | | Aircraft engines | Sold to English Electric, now the GEC industrial estate |
| Waterloo Mill, Clitheroe | Rover Motor Company, then Rolls-Royce | Cotton Mill | Jet Engine R & D | Sold to Lucas Aerospace, now housing |
| Clifton near Manchester | Magnesium Elektron | | Magnesium alloys | |
| Cofton Hackett, East Works, Longbridge | Austin | Farmland in Groveley Lane | Aero engines, Bristol Mercury and Bristol Pegasus radial engines Aircraft production – Fairey Battle, Stirling, Avro Lancaster, Vickers Wellingtons | Redeveloped as housing |
| Coventry, Stoke Aldermoor Lane | Humber | | Aero engines | |
| Crewe, Cheshire | Rolls-Royce | Farmland | Rolls-Royce Merlin | Bentley Crewe |
| Cwmbran, South Wales | Lucas | Farmland | Aircraft turrets | |
| Distington, Cumberland | High Duty Alloys Ltd | Farmland | Aircraft parts made of Hiduminium | Abandoned |
| Wheatley Hall Road, Doncaster | Crompton Parkinson | Greenfield site | .303 rifle ammunition | International Harvester tractors, site now redeveloped. |
| Drakelow Tunnels, Kidderminster | Rover Company | Hills | Parts for Bristol Mercury and Pegasus, and Rolls-Royce Meteor engines for tank use | Preserved as former Cold War site |
| Hillington, Glasgow | Rolls-Royce | Farmland | Rolls-Royce Merlin | Closed 2005, redeveloped as an industrial estate. |
| Valley Works, Langley Mill, Derbyshire | Collaro | | Various munitions items | Vic Hallam prefabricated buildings |
| Leavesden, Hertfordshire | de Havilland | Greenfield site | de Havilland Mosquito | Used by Rolls-Royce to manufacture helicopter engines, now used as a film studio |
| Melton Road Works, Leicester | British Thomson-Houston | | Aircraft magnetos and starter-motors | Used as a lamp factory by AEI which later sold its lighting interests to Thorn |
| Leyland, Lancashire, BX Factory | Leyland Motors | Greenfield site | Armoured Vehicle production 1940-1945 | Commercial vehicle production post war, site now re-developed |
| Pine End Works, Lydney, Gloucestershire | Factories Direction Ltd. | | Plywood for the aircraft industry | Demolished |
| Meir, Stoke-on-Trent | Rootes Securities | Air Field | Harvard assembly, Mustang modifications | Aerodrome, now housing |
| Reading, Berkshire | Vincents | Coachworks | Spitfire parts | Thames Tower office block |
| Reading, Berkshire | Great Western Motors | Garage | Spitfire parts | Retail park |
| Ryton, south east of Coventry | Humber | Farmland | Aircraft engines | Car production, now redeveloped |
| Salisbury, Wiltshire | Supermarine | | Spitfire assembly | redeveloped as housing |
| Samlesbury Aerodrome | English Electric | | Handley Page Halifax | BAE Systems aircraft factory |
| Lode Lane, Solihull | Rover | Farmland | Parts for Bristol Hercules radial engine | Land Rover Solihull manufacturing |
| Speke Airport, Lancashire | Rootes Securities | Speke Airport | Bristol Blenheim light bomber, Handley Page Halifax heavy bomber aircraft | Dunlop tyres, footwear, golf and tennis balls, now redeveloped as industrial estate |
| Staverton, Gloucestershire | Rotol | Staverton Airport | Variable pitch airscrews | Rotol Gloucester Airport |
| Errwood Park, Stockport | Fairey Aviation | | Beaufighters then Handley Page Halifax bombers | |
| Trafford Park, Manchester | Ford | Derelict motor assembly plant | Rolls-Royce Merlin | Modern industrial uses |
| Mosley Road, Trafford Park, Manchester | Metropolitan-Vickers | | Avro Lancaster | Modern industrial uses |
| Willesden, North London | Freestone and Webb | Coach builders | Wing tips for the Spitfire | Housing |
| Woodstock Mill, Oldham, Lancashire | H M Hobson | Cotton mill | Carburettors for aircraft engines | Seddon Atkinson truck factory, now used as a distribution centre |
| Moorcroft Mills, Ossett | Rotol | Hepworth Brothers Limited Textile mill | Variable pitch airscrews | Later sold to Jonas Woodhead and Son, manufacturer of vehicle shock absorbers, site now re-developed for housing |

## Strategic dispersal

The White Paper on Defence published in February 1937 revealed that steps had been taken to reduce the risk of air attack delivering a knockout blow on sources of essential supplies, even at the cost of some duplication, by building new satellite plants which would also draw labour from congested as well as distressed areas. There were still areas of severe unemployment.

### London Aircraft Production Group

In parallel with the Shadow Factory scheme, the London Aircraft Production Group (LAPG) was formed in 1940 by combining management of factories and workshops of Chrysler at Kew, Duple, Express Motor & Bodyworks, Park Royal Coachworks and London Transport.
The major activity of the group was the production of Handley Page Halifax bombers for the Royal Air Force, ammunition, gun parts, armoured vehicles and spare parts for vehicles. The group was led by London Transport from its works at Chiswick and Aldenham and the new De Havilland factory at Leavesden, Hertfordshire, which had a large purpose-built factory and airfield (construction of both was authorised on 10 January 1940) for production, assembly and flight testing of completed Halifax bombers.
The following list of eight members of the London Aircraft Production Group was published in March 1945: This includes LAPG members with factories at Preston, Speke and Stockport.
    English Electric in Preston
    London Passenger Transport Board — made the centre section and installed fittings and equipment for the front part of the fuselage
    Rootes Securities in Speke
    Chrysler Motors — rear part of the fuselage
    Express Motor and Body Works — intermediate wings and tail-plane
    Duple Bodies and Motors — the shell and components for the front part of the fuselage
    Park Royal Coachworks — outer wings
    Fairey Aviation Company in Stockport
from May 1941 they took responsibility for final erection followed by the test flight and their first aircraft was airborne before the end of 1941. They were allotted their own aerodromes instead of sending aircraft to the Handley Page aerodrome.
At peak the group involved 41 factories and dispersal units, 660 subcontractors and more than 51,000 employees,
Ultimately output rose to 200 Halifaxes a month and the group provided something like 40 per cent of the nation's heavy bomber output. Halifax bombers dropped more than 200,000 tons of bombs.
Sir Frederick Handley Page's "thank you" to these "daughter" firms was a luncheon at The Dorchester at which the head of each firm received a silver model of a Halifax bomber and representative workmen received scrolls of commendation.
Due to the high priority placed on aircraft production, large numbers of workers were drafted with little experience or training in aircraft production, with over half the workforce eventually being female. At its peak the LAPG included 41 factories or sites, 600 sub-contractors and 51,000 employees, producing one aircraft an hour. The first Halifax from the LAPG was delivered in 1941 and the last, named London Pride, in April 1945.

### Follow-on initiatives

The shadow factory proposals and implementation, particularly its rigidity when bombed, meant that other key areas of military production prepared their own dispersal factory plans:
* Alvis had 20 sites in Coventry alone, producing vehicles and munitions. Soon after the total destruction of the Alvis factory by enemy action in 1940 Alvis were operating eight dispersal factories and thus managed to resume deliveries of their most important products. They were allocated nine further dispersal factories following further enemy attacks and after Pearl Harbor at the end of 1941 Alvis organised, equipped and managed a new shadow factory to make variable pitch propeller hubs.
* Rover managed and controlled six shadow factories on behalf of the Government and ran eighteen different dispersal factories of their own.
When the Birmingham Small Arms plant at Small Heath, the sole producer of service rifle barrels and main aircraft machine guns, was bombed by the Luftwaffe in August–November 1940, it caused delays in productions, which reportedly worried PM Churchill the most among all the industrial damage during the Blitz. The Government Ministry of Supply and BSA immediately began a process of production dispersal throughout Britain, through the shadow factory scheme. Later in the war BSA controlled 67 factories from its Small Heath office, employing 28,000 people operating 25,000 machine tools, and produced more than half the small arms supplied to Britain's forces during the war.
* In British India in 1942, a Small Arms Factory in Kanpur was built as a shadow for the Rifle Factory Ishapore.

## List of dispersal factories (incomplete)

| Location | Owner | Original use | Wartime production | Today |
| Whitelands Mill, Ashton-under-Lyne | Avro | Cotton Mill | Aircraft parts | Abbey Thermosets |
| Axminster, Devon | Axminster Carpets | Carpets | Stirrup pumps | Carpets |
| Blackpool, Lancashire | Vickers | RAF Squires Gate | Bombers | Blackpool International Airport |
| Belfast, Northern Ireland | Short & Harland | | Bombers and Flying Boats | Short Brothers |
| Birmingham | Fisher and Ludlow | | | |
| Brechin | Coventry Gauge & Tool Co | | | Matrix International |
| Broughton, Flintshire | Vickers | Farmland | Aircraft production | Airbus Industrie, Broughton |
| Hargher Clough Mill, Burnley | Joseph Lucas Limited | Cotton weaving shed | Aircraft parts | Demolished |
| Byley, Cheshire | Vickers | | Vickers Wellington | |
| Wren Mill, Chadderton | Cossor | Cotton Mill | CRTs for Radar | Demolished, replaced by an Asda supermarket |
| Cheltenham, Gloucestershire | Smiths Instruments | | Clocks and watches | |
| Orchard Mill, Darwen | ICI | Cotton Mill | Perspex mouldings for aircraft canopies and windows | Lucite plastics |
| Distington, Cumbria | High Duty Alloys Ltd | Farmland | Aircraft parts made of Hiduminium | Abandoned |
| Crewe Toll, Edinburgh | Ferranti | | Electrical optical and mechanical assemblies | Ferranti |
| Ivy Mill, Failsworth | Avro | Cotton Mill | Aircraft parts | |
| Grantham, Lincolnshire | BMARC | Farmland | Hispano-Suiza 20 mm cannon | Redeveloped |
| Grappenhall, near Warrington | Metropolitan-Vickers | Leather tannery | Sintered carbides for cutting tools and armour piercing projectiles | Demolished and replaced by housing. |
| Hawarden, Flint | Vickers | Farmland | 5,540 Vickers Wellingtons and 235 Avro Lancasters | Airbus Industrie, Broughton |
| Hawthorn, Box and Corsham, Wiltshire | Bristol Aeroplane Company | Quarry, Bath stone | Intended for aircraft engines but little used | Became Central Government War Headquarters, closed 2005 |
| Hawthorn, Corsham, Wiltshire | BSA | Quarry, Bath stone | M1919 Browning machine gun | Abandoned under RAF Rudloe Manor |
| Hednesford, Staffordshire | | | Roller bearings | Fafnir Bearing |
| Ilminster, Somerset | Standard Telephones and Cables | Rope Works | Radio Valves | |
| East Lancashire Road, Liverpool | Napier & Son | | Aircraft engine production, Napier Sabre | English Electric then industrial estate |
| Linwood, Paisley Scotland | Beardmore's | Farmland | High-grade Steel for guns | Pressed Steel then Rootes Group's North Plant |
| Cowbridge House, Malmesbury, Wiltshire | EKCO | Country mansion | Radar equipment | Demolished and replaced by housing. |
| Newcastle-under-Lyme, Staffordshire | BSA | Farmland | Hispano-Suiza 20 mm cannon | Redeveloped |
| Newtown, Powys, Wales | Accles & Pollock | Farmland | Tubular steel: aircraft frames, gun barrels | Industrial estate |
| Northampton (Duston) | British Timken | Farmland | Roller bearings | Opened 1941, closed 2002 – moved to Poland. Demolished and replaced by housing. |
| Farme Cross, Rutherglen | EKCO | | Electrical components | Used as a sewing factory, now demolished |
| Sawbridgeworth, Hertfordshire | Walter Lawrence plc | Existing construction joinery workshops | Mosquito wings | Housing development |
| Cape Mill and Duke Mill, Shaw, Oldham | Marconi-Osram Valve, a subsidiary of GEC | Cotton Mills | CRTs for Radar, radio valves, instruments | Used as an Osram lamp factory, now closed |
| South Marston, Swindon, Wiltshire | Phillips & Powis Aircraft | Farmland | Aircraft production, largely Miles Master, shadowing Woodley factory | Honda car plant |
| Stonehouse, Gloucestershire | Sperry Gyroscope Co. Ltd | Textile Mill | Gyroscopes and instruments | Industrial estate |
| Stonehouse, Gloucestershire | Hoffmann Ball Bearings | Farmland | Ball bearings for aero engines | Industrial estate |
| Swaythling, Hampshire | Cunliffe-Owen Aircraft | Farmland | Parts for the Supermarine Spitfire | Ford Southampton plant |
| Swindon, Wiltshire | Plessey | | Electrical components | Plessey |
| Treforest, South Wales | Smiths Instruments | | KLG spark plugs | |
| Treforest, South Wales | Standard Telephones and Cables | | Quartz crystals | |
| Tubney Wood, Oxfordshire | Nuffield Mechanisation | | Bofors guns | |
| Weston-super-Mare, Somerset | Bristol Aeroplane | | Beaufighter | |
| Yeadon, Leeds, Yorkshire | Avro | | Avro York | Leeds Bradford Airport |
| Ystradgynlais, South Wales | Smiths Instruments | | Clocks and watches | |

## Extent

In June 1939 the response to a question in parliament was: 31 shadow factories were complete or under construction. The Air Ministry was responsible for 16 and, of those 16, 11 were working to full capacity. By that time large numbers of Bristol engines and aircraft were being made in Government owned shadow factories and in the Dominions and other foreign countries.
In February 1944 the Minister for Production, stated in Parliament that there were "in round figures" 175 firms managing agency schemes or shadow factories.

## National Archives catalogue entries

Information concerning the shadow factory plan and shadow factories can be found among the following records and descriptive series list code headings held by The National Archives. For the full set of references (including German shadow factories) see the Catalogue below:
| Catalogue reference | description |
| AIR 19/1-10 | Shadow scheme and factories, 1935–1940 |
| AIR 20/2395 AIR 20/2396 | Shadow factories schemes |
| AIR 2, code 6/2 | Aircraft production, shadow factories |
| AVIA 15, code 25/1 | Factories general |
| AVIA 15, code 25/5 | Shadow factories |
| T 161/1070 | Insurance of Government property managed or maintained by private contractors; `Shadow' factories |
| T 161/1156 | Banking: Shadow factories banking accounts |