IT FELL TO Terry Leyshon to make the final push. On March 20th he moved the last batch of coke from the oven onto a waiting railcar, ready to head to the blast furnace. Mr Leyshon has worked at the Port Talbot steelworks in south Wales since he was a teenager. Steel runs in his blood: it was his father who made the first push when the site opened in 1981. The blast furnaces will keep going for another few months by burning imported coke. But come October the giant white plumes that have risen from the smokestacks for 40 years will be gone.