David Cameron is facing mounting pressure from MPs and voters alike to exit the EU

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The European Court of Justice will tomorrow deliver a ruling that could force his Government to allow inmates to cast a ballot in European elections.

Senior Tories expected that the decision by the EU’s highest court will fuel the growing public anger towards Brussels and boost the crusade for a UK exit from the union.

Tory MP Philip Hollobone, a founding member of the Conservatives for Britain group of Eurosceptics, said: “If EU judges force us to give prisoners the vote it will cause uproar.

“Parliament voted recently to reject European judges’ demands to let convicted criminals vote in UK elections. But now the EU is threatening to bring it in by the back door.

“This shows how much control the EU has over every area of our lives. We need to take back control and vote to get out of the EU in the upcoming referendum.”