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Top Tories will defy David Cameron by holding talks on an electoral pact which could lead to a Cabinet post for UKIP leader Nigel Farage.

The rogue Westminster summit next month will also discuss how the two parties might form a coalition government.

And plans will be aired for retiring Tory MPs to make way for UKIP candidates at the 2015 General Election.

The House of Commons meeting with Mr Farage's party on June 24 is being organised by Tory think tank the Bow Group, whose president is former Tory PM Sir John Major, and Conservative Grassroots, representing local parties.

But Mr Cameron will be furious that two mainstream Tory organisations are plotting a deal with the minority party. The UKIP leader says he cannot work with the Tories until they ditch him.

"We'll explore all options," Bow Group chairman Ben Harris-Quinney told the Sunday People.

"We will discuss the possibility of an electoral pact and the form that might take."

Grassroots is still steaming over an unnamed top Tory calling them "mad, swiveleyed loons". Mr Harris-Quinney said Tory constituency associations might agree not to field a candidate if UKIP stood a better chance.

He expected to deliver two UKIP seats, one for Mr Farage.

"If they are elected there could be a coalition between UKIP and Conservatives," he added. "I imagine Nigel Farage would ask for a Cabinet position in return."

Another option would be for Conservatives to stand on a joint UKIP ticket. Speakers billed to appear at the June meeting include Eurosceptic Tory MP Douglas Carswell and UKIP's South East region chairman Roger Bird.

Dozens of Tory MPs fear they could lose their seats if their vote is split by UKIP members standing.

A UKIP spokesman said: "Conservative associations are welcome to back our candidates."