Union officials said the Government was planning to attack hours, holidays, sick pay and flexible arrangements under a review of working conditions announced last year.
PCS general secretary Mark Serwotka said the lives of civil and public servants were being made more difficult by cuts.
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Girl group 4th Power, a twerking grandmother and a skiving dental receptionist were among the contestants hoping to be the next big thing.
Rain expected in the next 24 hours - no surprise there with it being a Bank Holiday - but there'll also be some brighter skies in places.