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 aging 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 their Cowley plant in Oxford.^[4] As it turned out, the specialised high-output engines required by the RAF were made by Armstrong Siddeley, Bristol Aeroplane, Napier 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 by the aircraft's designers.^[5] 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 Castle Bromwich was withdrawn from Nuffield by Beaverbrook and placed under the wing of Vickers.^[6]

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.^[7]
• Extensions to existing factory complexes to allow either easier switching to aircraft industry capability, or production capacity expansion.

De Havilland Mosquito
Standard Motor Co, Canley and Herts.

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's Hercules engine. Bristol Aeroplane would not allow shadow factories to build complete engines, only components.^[8] The exception was Austin.

The first motor manufacturers chosen for engine shadows were: Austin, Daimler, Humber (Rootes Securities), Singer, Standard, Rover and Wolseley.^[5][9] In the event Lord Nuffield took Wolseley out of the arrangement and Singer proved to be in serious financial difficulty.^[7]

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.^[10]

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 m²). Later a 15 acres (61,000 m²) airframe factory was added, then a flight shed 500 feet (150 m) by 190 feet (58 m) was attached to the airframe factory.^[11]

Bristol Blenheim
Rootes Blythe Bridge and Speke

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.^[12] 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.^[13] By January 1938 two of those shadow factories were producing complete airframes.^[14] 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.^[15] It was said eight shadow factories constructing aircraft components were in production in or near Coventry in February 1940.^[16]

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.^[17] Ferranti's factory in Crewe Toll, Edinburgh will have been secret.

Empire

Similar plans were introduced in Canada, Australia, New Zealand and South Africa.^[18]

London Aircraft Production Group

Handley Page Halifax bombers 5 November 1944

In parallel with the Shadow Factory scheme, the London Aircraft Production Group^[42][43] (LAPG) was formed in 1940 by combining management of factories and workshops of

Chrysler at Kew,

Duple,

Express Motor & Bodyworks Limited,

Park Royal Coachworks and

London Transport.

The major activity of the group was the production of Handley Page Halifax bombers for the RAF, ammunition, gun parts, armoured vehicles and spare parts for vehicles. The group was led by London Transport from their works at Chiswick, Aldenham Works 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.^[42]

The following list of eight members of the London Aircraft Production Group was published in March 1945:^[44] This includes LAPG members with factories at Preston, Speke and Stockport.

Halifax has its 4 Merlins overhauled in a dispersal in Melbourne, East Riding of Yorkshire

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^[44]

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.^[45]

At peak the group involved 41 factories and dispersal units, 660 subcontractors and more than 51,000 employees,^[46]

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.^[44]

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.^[44]

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.^[42]

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.^[47] 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 Harbour at the end of 1941 Alvis organised, equipped and managed a new shadow factory to make variable pitch propeller hubs.^[48]
• Rover managed and controlled six shadow factories on behalf of the Government and ran eighteen different dispersal factories of their own.^[49]
• 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.^[50] 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.^[51]