 From 1922 coke oven gas was supplied to the Sheffield Gas Company, this continuing until the advent of gas from below the North Sea.At nationalisation the mining and coking operations were split, the coal processing and chemicals interests stayed with United Steel Companies under their subsidiary, the United Coke & Chemical Company.The collieries at Orgreave and Treeton were linked underground and as well as the coking plant the coal drawn by these collieries was fed to the washery at Orgreave Coal Preparation Plant.