John McNaughton on the steps of Newcastle City Hall this week and, inset, Callum Pull wearing the former lady mayoress chain the council says is now deputy lord mayor chain. Picture Marina Neil/ Simon McCarthy

City of Newcastle launched a formal investigation after former lord mayor John McNaughton challenged deputy lord mayor Callum Pull over his right to wear a ceremonial chain previously worn by the city's lady mayoresses.

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In a letter from City of Newcastle, the 88-year-old Freeman of the City, who served as lord mayor between 1986 and 1995, was asked to respond to allegations of

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