Unions have taken the next step in the battle for equal pay by asking for a judicial review against Falkirk Council in Scotland.
Peter Hunter, Unison's legal officer, said: "It is staggering that Falkirk Council still believes it can pay women less than men for work of equal value,” The Scotsman reports.
"It is also scandalous that a public body has the nerve to impose discrimination on its staff by sacking, or threatening to sack, all workers affected by these changes."
A spokeswoman for Falkirk Council said: "It is six months since the council took the decision to implement single status and it's disappointing the unions have waited till the last minute to challenge."
UK councils are facing a total of £3bn in equal pay claims, the Local Government Employers association warned last month.