Only 18 percent disagreed when asked about the following: "International conventions are in force banning chemical and biological weapons. The UK government should support a similar convention to ban nuclear weapons."

The remaining 18 percent said they did not know whether to agree or disagree.

The Campaign for Nuclear Disarmament (CND), which sent the survey by e-mail, said a draft convention aimed at outlawing all nuclear weapons and outlining inspection and verification procedures is lodged at the United Nations.

YouGov, which sampled 2,253 adults online between January 8 and January 10, also asked if the British government's decision to replace Trident will encourage states without nuclear weapons to develop them in future.

Some 43 percent agreed that it did, 29 percent disagreed and 28 percent did not know, according to the poll results. Bruce Kent, vice president for the CND anti-nuclear lobby, will give evidence to the Defence Select Committee, according to CND.

In a written submission to the committee, CND called the government's case an "inadequate and pedestrian response to the enormous security challenges facing Britain and the world today."

CND urged the government instead to initiate a global summit on nuclear disarmament and non-proliferation as well as support the draft Nuclear Weapons Convention lodged at the United Nations.

Prime Minister Tony Blair called last month for modernizing the Trident nuclear missile system currently based on four Vanguard class Royal Navy submarines, one of which is always on patrol and fully armed.

The plan calls for a new generation of nuclear submarines at a cost of up to 20 billion pounds (39.5 billion dollars).

While the Cold War is over, Blair said states like North Korea and Iran both had "highly dubious" reasons to pursue a nuclear weapons capability, and other rogue states were a distinct reason for Britain to keep its deterrent.

However, in an apparent concession to critics from within his own party and the anti-nuclear lobby, Blair promised to cut the number of stockpiled nuclear warheads by 20 percent from about 200 currently to 160.

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