Polling expert urges Tory caution
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Election 2017: Polling expert on Conservatives' chances

Prime Minister Theresa May has announced plans to call a snap general election on 8 June.

She said Britain needed certainty, stability and strong leadership following the EU referendum.

Professor John Curtice from the University of Strathclyde says the Conservatives are in a strong position - but has a few words of caution.

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