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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The legal battle began in 2011.
The debate during eight weeks of campaigning has been divisive and the result should be known on Saturday.