Conservative leader David Cameron is to unveil the party's new policy on Europe, after announcing the party would not hold a referendum on the EU treaty if they won the next general election.
The Tories previously said that if the Lisbon Treaty were ever to be ratified by all countries, the party "would not let matters rest there".
Eurosceptic Tory MP Mark Pritchard told Today presenter James Naughtie that he thought a manifesto pledge for a referendum to settle Britain's relationship with Europe would be "helpful".
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