Siddeley is a name associated with several notable entities, including the British aircraft manufacturer, Siddeley Aircraft Company, which was active in the early to mid-20th century. The company was known for producing various aircraft, including military and civilian models, contributing to aviation advancements during its operational years. Additionally, Siddeley is linked to the automotive industry through the Siddeley Deasy company, which manufactured cars in the early 1900s. This company was recognized for its engineering innovations and played a role in the development of early automotive technology, showcasing the versatility of the Siddeley name in both aviation and automotive fields.