During 1928, the studio was sold to Ludwig Blattner who connected it to the electricity mains and introduced a German system of sound recording. The Blattner Studio was leased to Joe Rock Productions during 1934, which purchased the site two years later. Rock Productions built four new large stages. The site was again sold, and taken over by the British National Films Company between 1939 and 1948, although during this period a large portion of the studio was taken over by the British government for war work.
