EADS Astrium was a satellite manufacturer and subsidiary of the European Aeronautic Defence and Space Company, EADS later Airbus. It was formed, as Astrium, in 2000 by the merger of Matra Marconi Space, DaimlerChrysler Aerospace and Computadoras, Redes e Ingeniería. The new company was a joint venture between EADS and BAE Systems until 2003 when the British company sold its stake. This led to the company being reorganised to become EADS Astrium with EADS as its sole shareholder. In 2004 CASA Espacio became part of the company. During 2013 Cassidian and Airbus Military were merged with EADS Astrium during a reorganisation of EADS. This led to the creation of Airbus Defence and Space within the newly created Airbus Group.

Matra Marconi Space was an aerospace company that was a jointly owned by the British General Electric Company (GEC) Group and the French Lagardere Group. Both of these larger companies merged their space and communications divisions, Marconi Space Systems and Matra Espace respectively, to form the new company in 1990. Claude Goumy of Matra was made the first Managing Director with Richard Wignall of Marconi as his deputy. In 1994 the company would acquire British Aerospace Space Systems and Ferranti Satcomms. 1997 would see the company’s Filton site close with some of the personnel being transferred to their Stevenage site and in 1999 British Aerospace would acquire Marconi Electronic Systems from GEC. This would create BAe Systems which replaced GEC as a joint owner of Matra Marconi Space. In 2000 the company merged with the space division of DaimlerChrysler Aerospace AG (DASA) to form Astrium.

The Dynamics Group was formed as a separate operating unit within British Aerospace on 1st January 1978 and took over the guided weapons and associated activities of the companies that had been merged to form BAe in 1977. Initially, the new organisation was headed by G.R. Jefferson, previously head of BAC Guided Weapons Ltd, with Tom Kent assisting as General Manager. When it was established the Group consisted of four divisions which were run as separate business units with their own specific responsibilities. These were ground-launched weapons, space and communications, both of which were based at the Stevenage site, ship-launched weapons, based at Bristol, and air-launched weapons, based at Hatfield. In its initial years, the group worked on a number of projects including the Sky Flash and P3T missiles as well as the Sea Dart and Seawolf systems used by the Royal Navy. It also was involved in the European Communications Satellite (ECS) programme and the Marecs satellite. In January 1980 British Aerospace Dynamics Group was joined by Admiral Sir Raymond Lygo, as deputy chairman, and Tom Kent was promoted to Deputy Group Chief Executive. The Group also began a number of international cooperations including the Euromissile Dynamics Group (EMDG) with Aerospatiale and Messerschmitt-Bölkow-Blohm (MBB), which aimed to develop a new anti-tank missile and a programme with BTG in Germany relating to the AIM 9L Sidewinder missile. 1980 also saw the group working on the Sea Eagle anti-ship missile, the production of Sky Flash, Rapier and MILAN, and the development of the Giotto probe for the European Space Agency. In August 1980 G.R. Jefferson became Chairman of British Telecom and he was replaced as Chairman and Chief Executive of the Group by Admiral Sir Raymond Lygo. 1981 would see British Aerospace become a Public Limited Company but operations in the Dynamic Group would continue with the same structure as had already been in place. It would continue to work on various missile contracts, including Sea Skua for the Royal Navy and Sky Flash for Sweeden, and would also establish new facilities at the Stevenage site for circuit development and plastics production. In 1982 Sperry Gyroscopes was acquired by the Group and would become a division within it, known simply as Bracknell. The same year would also seem the sale of the Industrial and Vehicle weighing activities, which had previously been part of the division based at Hatfield. Sir Reymond Largo would also become Managing Director of British Aerospace and was replaced by Hugh Metcalfe. 1983 saw the group work on a Cargo Surveillance System and the Sea Urchin mine as well as cooperation with other organisations. This included Bodenseewerk Geraetetechnik/BAe GmBH, a joint company with Germany for missile development and production, and the Wind Energy group, which produced a prototype for the largest wind turbine generator erected in the UK. During 1985 British Aerospace underwent a restructuring as it prepared for privatisation which had been announced by the British Government in 1984 when it stated that it was prepared to sell its 48.43% in BAe to a successful bidder, and this was to occur in May 1985. As part of this restructuring the management structure of the company underwent a streamlining process and this involved the absorption of the Aircraft and Dynamic Groups into one single structure. As a result the Dynamics Group formally ceased to exist on 1st June 1985.

Hawker Siddeley Dynamics Limited (HSD) was a defence and electronics manufacturer formed on 1st July 1963 as part of a reorganisation within the Hawker Siddeley Group. The new company was a consolidation of the missile and equipment interests of De Havilland, Whitworth Gloster and A.V. Roe, all of which had previously operated separately within the Group. The new establishment consisted of over 15,000 staff, headed by Sir Arnold Hall as chairman, operating on sites at Hatfield, Lostock, Farnworth, Lakefield, Stevenage, Welkin House, Conquest House, Woodford, Whitely, Spadeadam and Woomera. It would take over all of the projects these companies were involved in including the Firestreak, Blue Streak, Red Top, Blue Steel, Seaslug and CF.299 missiles, and various air-conditioning, fuel control and power supply projects. It also continued as the British representative on the ELDO (European Launcher Development Organisation) project. In August 1964 the company was chosen to supply air-conditioning equipment to the Concorde project and also announced the development of the Sea Dart missile for the Royal Navy. In 1966 it would also announce a further missile project when the Martel was unveiled in cooperation with Engins Matra. Beyond these military projects, there was also a great deal of work in the civilian sector including the design of the suspension and brake system for British Rail’s prototype Advanced Passenger Train (APT), which was awarded to them in 1969. In 1977 the Aircraft and Ship Building Act created British Aerospace (BAe) and Hawker Siddeley Dynamics, along with Hawker Siddeley Aviation, the British Aircraft Corporation and Scottish Aviation, were merged into it. The none aviation aspects of Hawker Siddeley would continue as a separate company until 1991 when it was acquired by BTR.

De Havilland Propellers Limited was established as a division of De Havilland Aircraft in 1935 to manufacture variable pitch propellers under licence from the Hamilton Standard Company. In 1946 it was incorporated as a subsidiary company based at Hatfield, with a manufacturing facility in Lostock. In addition to the manufacture of propellers the company would work on missile projects from the late 1940s and would diversify into industrial equipment in the 1950s. This decade would also see the company begin work on the Blue Jay project, which became the Firestreak heat-seeking missile, and Blue Streak, both as a missile and later as part of the European satellite launch programme. In 1960 the company, along with its parent, would become part of the Hawker Siddeley Group and the decision was taken to merge De Havilland Propellers and the De Havilland Aircraft Company into a single entity. This was known as the de Havilland Aircraft Company and removed the need for de Havilland Holdings which ceased to function. The new join company would continue to operate independently inside the Hawker Siddeley Group until 1963 when a reorganisation transferred the missile and equipment interests that had been de Havilland Propellers into Hawker Siddeley Dynamics.