Thousands of ambulance workers are set for walkouts before Christmas as the Health Secretary branded pay demands "not affordable".
Call handlers, ambulance technicians and paramedics in the North East, North West, London, Yorkshire and the South West will be called out on strike in a long-running dispute over pay and staffing, Unison said.
An announcement of the dates for walkouts is expected in the coming days, in what would be the first national ambulance strike in decades.