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Former Conservative British Prime Minister Sir John Major addresses delegates in Solihull in central England on April 21, 2015. Image Credit: AFP

London: Former British Prime Minister John Major will urge voters on Tuesday to reject a "weak and unstable" Labour government subjected to a "daily dose of political blackmail" by the Scottish National Party (SNP), the Times reported.

Opposition leader Ed Miliband would be dragged to the left and sacrifice the interests of the rest of the United Kingdom to keep SNP leader Nicola Sturgeon's support, Major will say, the newspaper reported. (http://thetim.es/1K0swY4) British Prime Minister David Cameron said on Sunday that he was getting advice from Major, who took to the streets on a soapbox to secure a shock win against a confident Labour in 1992.

Polls indicate that a hung parliament is the most likely outcome of the May 7 election, with neither Cameron's Conservatives nor the opposition Labour Party likely to win an outright majority.

A post-election deal between the Labour Party and Scottish nationalists to rule Britain could break up the country, Major had warned last month.