An agreement between the NUM and ISTC over deliveries of 15,700 tonnes of coal per week to Scunthorpe broke down after an explosion in the Queen Mary blast furnace at the plant on 21 May 1984. It took two hours to douse the flames and a further eight hours to stop the liquid iron bursting through the brickwork. This was considered a result of the poor quality of coal supplies. Attempts by the ISTC to persuade the NUM to deliver more coal did not bring immediate results, with the divisional official Roy Bishop writing on both the physical dangers to the workers by the Queen Mary and the possibility of irreversible damage to the furnace. As the NUM did not respond immediately, British Steel decided to act quickly to find alternative supplies. The company ordered a large consignment of coal from Poland to be delivered to Flixborough, Lincolnshire, and spoke to every haulage company it had ever used to arrange for non-unionised hauliers to transport the coal. In addition, an order was made for 5,000 tonnes of top-quality coke to be delivered from Orgreave to Scunthorpe.