The redoubt was a arms and munitions storage facility rather than a factory, the delapidated biuldings out front are from when it was a transmitter station later in its life, in the fields opposite you can see the large concrete stays wich held wires to keep the masts up, I think BT had the run of the place at one point wich is where the ceramics probably came from, theres a second alan williams by the bridge.
Dave