Okay, so you know how some people don't like nuclear weapons and power plants? There are some people in the United Kingdom who really don't like them! They are called the anti-nuclear movement.
This movement started in the 1950s when people first started worrying about the dangers of nuclear weapons and radioactivity. People were scared because if there was a nuclear war, it could make the whole world very sick and dangerous to live in. So, the anti-nuclear movement wanted to make sure that the United Kingdom didn't have any nuclear weapons or power plants.
One of the most famous anti-nuclear protests happened in 1982 when a group of people wanted to stop the building of a nuclear missile base in a place called Greenham Common. They camped outside the base for years to make sure the government knew they didn't want any nuclear weapons on their land.
The anti-nuclear movement also didn't like nuclear power plants because they use a lot of energy and can be dangerous if something goes wrong, like what happened in Chernobyl in Russia. They wanted the UK to find other ways to make energy, like using wind or solar power.
So, in short, the anti-nuclear movement in the United Kingdom are people who are trying to stop the country from having or using nuclear weapons and power plants because they believe that they are too dangerous and harmful for people and the environment.