Former Tory chairman Lord Tebbit has claimed that the UK Independence Party has been infiltrated by MI6.

Tebbit says in the Specator that he is "perfectly sure" that two members of the UKIP had been members of the security service.

The UKIP, largely bankrolled by millionaire eurosceptic Paul Sykes, is fielding 450 candidates in the election.

It predicts its support of withdrawal from the EU could gain it more than a million votes at the election, mostly at the expense of the Conservatives.