Action AWE and Trident Ploughshares blockaded the Atomic Weapons Establishment (AWE) in Burghfield today (2 September)
The veteran peace activist Bruce Kent and CND General Secretary Kate Hudson also took the Cut Trident message to Westminster
Twenty one protesters were arrested after blocking the gates of the nuclear weapons facility which provides warheads for the Trident weapons system. They demanded the cancellation of plans to replace Trident and called on the UK to comply with the nuclear Non-Proliferation Treaty (NPT) and join multilateral negotiations to ban all nuclear weapons.
Activists from around the world joined the blockade, including campaigners from Argentina, Belgium, Finland, France, Germany, Japan and Spain.
Action AWE, which co-ordinated the protest with Trident Ploughshares, said in a statement that they were taking part in "non-violent direct action".
They said nuclear weapons were "immoral, illegal under international law, dangerous to maintain and pose a danger to peace on Earth".
Kate Hudson said: "In Westminster today, we stood in solidarity with all those blockading AWE Burghfield. Such actions are vital in bringing into focus the UK government’s attempts to spend over £100 billion on a new generation of nuclear weapons."
"While the government tells us that it doesn’t have money for local services, for hospitals, schools and libraries: how can it possibly justify spending billions upon billions on a weapons system which much of the military doesn’t want?
"As we head towards a parliamentary vote on Trident replacement in 2016 – we must stand shoulder to shoulder with all those who oppose this heinous, immoral and irresponsible waste of our money. We must make Westminster hear loud and clear: Britain doesn’t want nuclear weapons!"
The UK's four ballistic missile submarines are due to be renewed from the late 2020s and the government's final decision on whether to renew or replace the Trident missile system is due in 2016.