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David Cameron will not be able to deliver fundamental reform of the EU without changing its treaties, a committee of MPs says.

Conservative MP Sir Bill Cash, who chairs the European Scrutiny Select Committee, told the Today programme it is "essential" that there is a treaty change.

"The question of whether or not the European Union would be effectively dominated by the Eurozone... would require a treaty change," he said.

"We've concluded that... it is absolutely essential that we get a treaty change if we're going to actually achieve the objectives that the Prime Minister has set out," he said.