 In the 1920s, the company was heavily involved in the creation of the UK National Grid.The opening of a new purpose-built company headquarters (Magnet House) in Kingsway, London in 1921, and the pioneering industrial research laboratories at Wembley in 1923, were symbolic of the continuing expansion of both GEC and the electrical industry.In World War II, GEC was a major supplier to the military of electrical and engineering products.