The anti-nuclear movement in the United Kingdom consists of groups who oppose nuclear technologies such as nuclear power and nuclear weapons. Many different groups and individuals have been involved in anti-nuclear demonstrations and protests over the years.
One of the most prominent anti-nuclear groups in the UK is the Campaign for Nuclear Disarmament (CND). CND's Aldermaston Marches began in 1958 and continued into the late 1960s when tens of thousands of people took part in the four-day marches. One significant anti-nuclear mobilisation in the 1980s was the Greenham Common Women's Peace Camp. In London, in October 1983, more than 300,000 people assembled in Hyde Park as part of the largest protest against nuclear weapons in British history. In 2005 in Britain, there were many protests and peace camps about the government's proposal to replace the ageing Trident weapons system with a newer model.
In October 2010 the British government announced eight locations it considered suitable for future nuclear power stations. This has resulted in public opposition and protests at some of the sites. The Scottish Government, with the backing of the Scottish Parliament, has stated that no new nuclear power stations will be constructed in Scotland. In March 2012, RWE npower and E.ON announced they would be pulling out of developing new nuclear power plants. Analysts said the decision meant the future of UK nuclear power could now be in doubt.
There are large variations in peoples’ understanding of the issues surrounding nuclear power, including the technology itself, climate change, and energy security. There is a wide spectrum of views and concerns over nuclear power and it remains a controversial area of public policy. Nuclear power currently provides around 20% of the UK's electricity.