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By Alastair Macdonald BRUSSELS (Reuters) - In a vivid display of fury at European Union technocrats, British Prime Minister David Cameron refused to pay a surprise 2.1-billion-euro (1.65 billion pound) bill on Friday as EU leaders ordered an urgent review of the calculations used. Eurosceptics at home branded the EU a "thirsty vampire" for seeking an additional, immediate sum worth a seventh of London's annual payment following a major statistical review of national incomes. Cameron demanded action from fellow leaders at a summit, calling the sudden bill "completely unacceptable". Cameron told reporters Italian Prime Minister Matteo Renzi lambasted "bureaucrats without a heart", who made it harder to fend off the attacks of Eurosceptics.