Birmingham City Council has become the latest local authority to face huge equal pay claims.
More than 50 female council workers are claiming an estimated £15,000 each in back pay and another 20,000 women, including care home staff and cleaners, could follow suit.
The legal action by Carvers Solicitors is worth an estimated £750,000 but several other Midlands law firms are actively targeting other council workers who may have equal pay claims, Birmingham Mail reports.
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The women workers claim that their male colleagues have been paid significantly more for doing the same role over a period of several years.