The Slough Trading Estate founded in Slough in Buckinghamshire in 1920, was an early business park in the United Kingdom. According to the estate's owners and operators, Segro, Slough Trading Estate consists of 486 acres (1.97 km2) of commercial property in Slough and provides 7,500,000 sq ft (700,000 m2) of accommodation to 500 businesses and has a working population of about 20,000 people. Slough Trading Estate is the largest industrial estate in single private ownership in Europe. There are over 600 buildings. The estate is home to 400 tenants from countries including the US, France, Italy, Japan, Germany and South Korea. Companies using the park include Fiat Group Automobiles, Centrica, Hibu, Electrolux, GSK, Mars Confectionery, Akzo Nobel, Virgin Media, O2, AxFlow UK, the datacentre o