Workers at at Bradford's National Science & Media Museum are to be balloted on industrial action in a dispute over pay.
Trade union Prospect said its members at the museum will vote in the next few weeks on whether to launch a campaign of action.
The ballot also involves staff at other museums the Science Museum and Blythe House in London, the National Railway Museum in York, the National Collections Centre in Wiltshire, and the Science & Industry Museum in Manchester.
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The union said the move followed the imposition of a below-inflation pay rise of 1.5%, claiming that workers had suffered a 13% real-terms pay cut since 2010.
Prospect negotiations officer Sharon Brown said: "Our members in the Science Museum Group love what they do but they cannot carry on with year after year of real-terms pay cuts.
"How can they be expected to provide stability for their families under these conditions? The Science Museum is one of the top tourist attractions in the country - people will be astonished at how poorly its staff are paid.
"For years our members' pay has risen by less than inflation and the imposition this year of yet another below-inflation, 1.5% pay rise is especially galling when the director has seen his pay increase by a third in just four years.
"At the bottom of the pay scale workers are unacceptably still earning well below the Real Living Wage."
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