The pay gap between men and women is wider in the City of London than anywhere else in the UK, according to the GMB union.
Its research, based on figures from the Office for National Statistics, shows a 58 per cent difference in average earnings in the City of London, as against the UK average of about 19 per cent.
Inequalities in pay are almost as big in Anglesey, Hartlepool and Blackpool, the GMB said.
The areas with the lowest disparities include East Lothian and Stirling and the London Borough of Lewisham.
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