 The police station was significantly smaller than subsequent versions, with almost-all of the interior offices being seen on-screen - Only the original packing/warehouse area alongside the rear yard not featuring.Production offices doubled with some of the sets, with the canteen being used by cast and crew, and notably Chief Superintendent Brownlow's office actually being that of producer Michael Chapman.When shooting was taking place upstairs, the production team were unable to continue typing or to take phone calls.