Engineering and allied industries comprise the single largest sector, contributing 30.8% of total Gross Value Added in manufacturing in 2003. Within this sector, transport equipment was the largest contributor, with 8 global car manufacturers being present in the UK. These include British makers now owned by overseas companies such as BMW (MINI, Rolls-Royce), Tata (Jaguar-Land Rover), Volkswagen (Bentley) and General Motors (Vauxhall Motors) and plants making vehicles under foreign ownership and branding such as Honda, Nissan and Toyota with a number of smaller, specialist manufacturers (including Lotus and Morgan) and commercial vehicle manufacturers (including Leyland Trucks, LDV, Alexander Dennis, JCB, the main global manufacturing plant for the Ford Transit, Manganese Bronze and Case-New Holland) also being present. The British motor industry also comprises numerous components for the sector, such as Ford's diesel engine plant in Dagenham, which produces half of Ford's diesel engines globally.
A Rolls-Royce Trent 900 engine on the wing of an Airbus A380.
A range of companies like Brush Traction and Hunslet manufacture railway locomotives and other related components. Associated with this sector are the aerospace and defence equipment industries. The UK manufactures a broad range of equipment, with the sector being dominated by BAE Systems, which manufactures civil and defence aerospace, land and marine equipment; VT Group, one of the world's largest builders of warships; and GKN and Rolls Royce, who manufacture aerospace engines and power generation systems. Commercial shipbuilders include Harland and Wolff, Cammell Laird, Abels, Barclay Curle and Appledore. Companies such as Princess, Sealine, Fairline Boats and Sunseeker are major builders of private motor yachts.
Another important component of engineering and allied industries is electronics, audio and optical equipment, with the UK having a broad base of domestic firms, alongside a number of foreign firms manufacturing a wide range of TV, radio and communications products, scientific and optical instruments, electrical machinery and office machinery and computers.
Chemicals and chemical-based products are another important contributor to the UK's manufacturing base. Within this sector, the pharmaceutical industry is particularly successful, with the world's second and third largest pharmaceutical firms (GlaxoSmithKline and AstraZeneca respectively) being based in the UK and having major research and development and manufacturing facilities there.