[2] As part of this, it appears that they took over the glassworks, where possible learning technological advances in one industry to develop the other, and perhaps adapting the glass cone into a cementation furnace.

Although the glassworks then closed, and there are no above-ground remains, English Heritage consider it likely that there are significant underground structures, along with discarded glass, and this forms part of the justification for the listing of the site as a Scheduled Ancient Monument.

[3] Completed the following year, it included two large buildings: a two-storey heat treatment workshop and a three-storey steel working shop.

[3] Sandersons had finally stopped using their cementation furnaces in the 1920s, and Kayser Ellison soon demolished these, along with the west range of crucible steel shops from the 1870s.

[11] The gas-fired crucible furnaces and the gas plant were demolished, but English Heritage believe that substantial remains of these exist below ground.

[3] By the end of the 20th century, Sanderson Kayser had concentrated production on its nearby Newhall Road site, and left the Darnall Works disused.

[13] A plan to restore the listed buildings and construct new warehouses on the remainder of the site, enabling the return of steelmaking to the area, was announced in 2006.

[15] Instead, by 2010, £800,000 was raised to restore the Grade II* buildings at the site: the south-east and south crucible workshops; repairing their roofs and enabling reuse of the structures.