Ukip is set to win 27% of the vote in the upcoming European elections, a poll by YouGov and The Sun newspaper claims.
Trailing behind Ukip with 26% is Labour, with the Conservatives far behind the two with 22%, the poll suggests.
The Green Party comes in with 10% and the Lib Dems with 9%.
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Chancellor George Osborne will seek to reassure financial markets on Monday morning following Britain's decision to leave the EU.
In his first outing since the referendum result, the lead Leave campaigner has outlined his vision for a post-Brexit Britain.