The poll interviews were carried out by ComRes for the BBC between 21 and 30 March.

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For the poll, conducted for Newsnight by ComRes, 1, 002 British adults were questioned between 9-12 December 2011.

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ComRes interviewed 1, 009 16- to 18-year-olds currently studying for their A-levels.

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ComRes polled more than 3, 013 UK adults over three weekends in late November and December, including 600 people with a "long-standing mental or physical disability or condition".

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One in five of those who did not bother with a survey later uncovered faults, according to research involving more than 1, 000 buyers conducted by ComRes for Rics.

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Still, in an opinion poll by ComRes done just after the debate, he was rated the winner by 43%. 26% backed Mr Cameron, who edged out Mr Brown.

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The survey was carried out for disability charity Scope by ComRes, which held online interviews with 386 disabled adults and 111 parents (and eight carers) of disabled people in August.

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The investigation follows research commissioned by BBC Inside Out and carried out by ComRes to examine whether students have been put off university because of the increase in tuition fees.

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The meeting begins on a day an opinion poll for BBC Local Radio by ComRes - which questioned 2, 500 people in England - suggests most people think Dr Williams has been a good leader.

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