UK poll shows support for EU exit

A UK opinion poll suggests 42 per cent of voters want Britain to leave the European Union while 31 per cent are opposed to the exit.

A British opinion poll suggests 42 per cent of voters want Britain to leave the European Union. (AAP)

A British poll suggests more voters want the UK to leave the European Union than stay in - but around 12 million remain to be persuaded either way.

The OnePoll survey of 2000 adults for ITV suggested the "out" camp would outscore "in" by 42 per cent to 31 per cent if there was an immediate referendum.

It also found high demand for a cap (60 per cent) or even an outright ban (23 per cent) on citizens of other EU countries being free to emigrate to Britain - with respondents considering EU immigration as a bad thing by 44 per cent to 30 per cent.

More than a quarter of voters are still open to persuasion either way, the poll suggests.