In a rare display of cross-party unity, British leaders pleaded with Scottish voters on Wednesday to reject Scotland's bid for independence in next week's referendum.

The YouGov polls released on Sunday indicated that for the first time in Scotland's lengthy campaign for independence from Britain, the pro-independence camp has gained ground.

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In what pro-independence calls a panic measure, three of Britain's major political leaders postponed their weekly House of Commons session to court support for a united UK in Scotland.

Prime Minister David Cameron, who seems to be consigned to history as UK's last prime minister, said it would break his heart if Scotland would break off its 300-year-old union with Britain.

The prime minister appeared to be on the verge of tears as he reminded an invited audience in Edinburgh that the referendum is an irreversible decision.

"It is a decision about the next century" and not an election to determine the country's future for the next five years, Cameron said.

According to Associated Press, Cameron is likely to step down from his Conservative Party should the referendum on September 18 result in Scotland's independence.

Cameron's party has become increasingly unpopular in Scotland following Prime Minister Margaret Thatcher's policies that cut massive corners in Scotland's budgets, which many independence supporters reportedly said is one reason why they are moving for a separation.

Labour leader Ed Miliband similarly abandoned Westminster to campaign for the union to stick together.

Miliband's impassioned speech to Labour supporters in Glasglow yesterday promised a stronger UK with Scotland in it.

Scotland's secession will make it harder for the Labour party to take control of the British Parliament. Miliband's party currently holds two-thirds of Scotland's Parliamentary votes.

But major pro-independence leaders like Alex Salmond seemed unmoved, reported AP.

Just last month, Salmond's Yes campaign was behind in the polls by 22 points.

An opinion poll released in Glasgow's Daily Record newspaper one week before the referendum gave No camp 53 percent lead over the Yes camp's 47 percent support. This follows the YouGov polls released over the weekend which had major political leaders and business investors worrying about Britain's economic and political future.

Better Together leader Alistair Darling remains confident of a vote against independence, but has warned Scotland voters that the September 18 referendum is a lasting decision, reported the Sky News.

TagsScotland referendum, scotland's independence, UK, Prime Minister David Cameron