The BBC documentary about it which has just finished claims that the fuel cartridges were made more risky by the call to produce more plutonium for nuclear weapons, and that it was this that caused the fire. Prime Minister Macmillan who was negotiating to be a nuclear partner with the US and share its research, suppressed this from the report. It was manipulated that the workers at Windscale who had prevented a catastrophe be blamed for errors leading up to the fire.