The Prime Minister’s team has confirmed to ITV that Mr Johnson will not find time for an interview before the General Election.

He is the only leader of a major party to turn down the request from the channel’s Tonight programme, having also declined to be interviewed by the BBC’s Andrew Neil.

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A spokesman for ITV said: “The ITV News team making the Boris Johnson Tonight film made the original bid for the Prime Minister when the election was called.

“They have contacted his press team on repeated occasions with times and dates offered to film an interview.

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“Boris Johnson’s team have today confirmed he will not be taking part.

“The programme will instead feature a profile of the Prime Minister using fresh interviews with other contributors and archive footage.”