Rail workers and nurses will strike again next month, while frontline Royal Mail workers are also threatening a new wave of strikes.
Tens of thousands of RMT members will strike again beginning on 16 March after the union received "no new offers" from employers involved in the national rail dispute.
The RMT revealed the start of the next phase of action, following months of sporadic disruption, having earlier rejected the terms offered by Network Rail and 14 train operators on the ground they "did not meet the needs of members on pay, job security or working conditions".
The union did not give any further dates but said a "programme" of strike action loomed.
It added that its members at Network Rail would also commence an overtime ban that would hit maintenance and operations.
"RMT is seeking an unconditional offer from rail operators and Network Rail", its statement said.
The union had described as "dreadful" a 5% pay rise, backdated to January last year, along with a 4% hike for 2023.
The Royal College of Nursing (RCN) said no services will be exempt, meaning the strike will involve for the first time nursing staff working in emergency departments, intensive care units, cancer care and other services that previously did not take part.
Meanwhile, the union representing 112,000 frontline Royal Mail staff has revealed a fresh mandate for industrial action.
The Communication Workers Union (CWU) announced that 95.9% of its members had voted in favour of renewed strikes on a 77% turnout, though it stopped short of announcing new dates immediately.