The Liberal Democrats may count on 10 percent of votes, which is 1 percent less than a week ago.
A total of 5 percent of respondents said they would vote for the Eurosceptic UK Independence Party (UKIP), which is also 1 percent lower in popularity than a week ago.
The poll was conducted on Tuesday-Wednesday, with 2,066 adults having taken part in it.
On April 19, the UK House of Commons backed Prime Minister Theresa May's bid for an early general election on June 8. May said the snap election was aimed at overcoming divisions in parliament, succeeding in Brexit negotiations with the European Union, and ensuring stability in the country.
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