The British government has been quietly exchanging intelligence on key policies with multinational companies in an effort to protect and promote their plans for new nuclear power stations, according to internal documents seen by the Guardian.

The Department of Energy and Climate Change (Decc) has also passed the Nuclear Industry Association (NIA), which represents 260 companies, and the French nuclear company, EDF Energy, details of its court battle against Greenpeace, which is trying to block the nuclear plans.