Ukip leader Nigel Farage. His party is up one point to 14% in the latest Opinium/Observer poll. Photograph: Suzanne Plunkett/Reuters.

Ukip on 14% as Labour restores double digit lead over Tories – poll

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Anti-EU party and Labour up 1% compared to two weeks ago, Observer/Opinium poll finds

Ukip has risen to 14% – almost half the level of support for the Conservatives who are now on 29% – in a new Observer/Opinium poll.

The anti-EU party is up one point compared to two weeks ago, continuing a strong performance that will cause alarm among Tory supporters, and increase pressure on David Cameron to call an in/out referendum on Europe.

State of the parties graphic — Credit: Observer graphics

Labour, up one point on 39%, will be pleased to have restored a double digit lead over the Tories but frustrated that it cannot break consistently past the 40% mark, given the government's economic troubles.

The Lib Dems are struggling to make progress and are down one point at 8%.

All three party leaders have seen their personal ratings fall. David Cameron is down four points to -19%, while Ed Miliband is down three at -16% and Nick Clegg down three at -46%.

Separately, the poll asked people if they would be prepared to pay more for goods if they knew the company producing them paid a living wage of £7.45 per hour across the UK, and £8.55 in London.

47% said they would probably or definitely be prepared to do so while 37% said they probably or definitely would not. 16% were undecided.