29 jail cell The scenes were shot in the Detention Block, Cambridge Barracks, Woolwich, London. The file contains: letters from and to Bernard Williams [Production Manager], 29 Jul-13 Aug 1970 and a memo about prison furniture in Wormwood Scrubs, 16 Jul 1970; and photographs of the location, including the exercise yard where marching is being pre-enacted and internal shots. 1970