We weren't even allowed into the control room, then. It was Us and Them. They had white shirts and ties in the control room, they were grown-ups. In the corridors and back rooms there were guys in full-length lab coats, maintenance men and engineers, and then there was us, the tradesmen. We came in through the tradesman's entrance and were helped by the lower people in the organisation to set up our stuff. (…) We gradually became the workmen who took over the factory. In the end, we had the run of the whole building.