Widespread strike action could run into the Spring if hundreds of thousands of workers vote for walkouts in looming ballots.
PCS General Secretary Mark Serwotka warned that disputes over pay and working conditions could run for "months" - and said people were fed up of the Government's "callous, brutal dismissal" of workers' concerns.
As Liz Truss's Government was plunged into deeper crisis, union leaders in Brighton supported a bid to coordinate strikes for maximum impact.
