Coal gas
By the 1920s, a combination of the reducing calorific value of the waste and an end to Sunday collection of waste, led to an additional Babcock &amp; Wilcox boiler being installed and used when there was insufficient waste for the destructor furnaces. This boiler was fuelled by coke, a by-product of the Coal gas production process, often being sourced from the Cambridge gas works next to the pumping station.