ComRes opinion poll for The Independent on Sunday, Dec 11 Two thirds of Conservative voters agree (68%), compared to half of Labour (50%) and Lib Dem voters (47%). There is a trend by age, with older people more likely than younger people to agree -- 70% of people aged 65 and over agree, compared to 44% of people aged 18-24. 70% of voters want a vote on Britain's EU membership; just 23% are against. 49% would vote to get Britain out of Europe; just 40% prefer to stay in. There is a clear majority for staging a referendum in all social classes and regions of the UK. Men and women are similarly keen, although rather more Conservative (71%) than Labour voters (65%) are calling for a poll. 56% of Tory voters would vote to leave, against 34% who would prefer to stay in. By contrast among Labour and Liberal Democrats, there are majorities for staying in Europe, although there are also sizeable minorities among both parties' supporters -- 38% and 44% respectively -- who would vote to get out. 28% of the youngest voters aged 18-24 would vote to quit the EU; 63% of those aged 65 and over would do the same. The Eurosceptic side of public opinion is firmer than the Euro-enthusiast element. The 40% who would vote to stay in split between 23% who would definitely vote to stay in and 18% who say they would only probably do so. Among the 49% who want to leave,