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Politically, he briefly backed the Trotskyite Militant Tendency in his youth.

He is backed by the Socialist Party, a successor organisation to the Trotskyite Militant Tendency, and is not expected to come close to winning.

The 71-year-old former deputy leader of Liverpool City Council was kicked out for belonging to Militant Tendency.

He is also likely to face questions over reports that Derek Hatton - the face of the hard-left Militant Tendency group in the 1980s - had had his application to rejoin the party approved.

The Militant Tendency, which emerged from a Trotskyite group called the Revolutionary Socialist League, held key positions in the Liverpool Labour Party as it battled the Conservative Thatcher government in the 1980s.