Leading eurosceptic Conservative lawmaker Jacob Rees-Mogg said if Britain were to stay in the European Union beyond April 12, the country should become the bloc's most difficult member and veto a seven-year financial framework.

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"If we are forced to remain in we must be the most difficult member possible," Rees-Mogg, leader of the ERG, a eurosceptic group in the governing Conservative Party, told Sky News on Sunday.

"When the multi-annual financial framework comes forward, if we're still in, this is our one in seven-year opportunity to veto the budget and to be really very difficult."