Henry Workmans Sawmills were the original users of this building. The image shown is the same building, but occupied by Quaker Chemicals. This building has since been pulled down and replaced with something rather more modern, shown in the lower image. The sawmills had their own railway siding, as did many of the mills in this valley. My research also reveals that the sawmills had two teams of horses and a Burrel traction engine to haul the timber. A large chimney was located just behind the building, which has since been taken down.
Mervyn Little has kindly provided the following additional information... Workman's Sawmills were driven by a large Hi/Lo pressure steam engine which drove Lineshafts and belts to the various saw's. In addition to the traction engine and horse teams they used 2 mobile steam cranes which ran on rails, these also crossed the A46 road and brought logs from their other stockyard ( currently Browns fencing & DIY area ) into the main yard for cutting up.