Staff at every ambulance service except one across the country will go on strike on March 8, Unison has announced.
Up to 32,000 NHS workers at the union - including nurses, blood collection workers, healthcare assistants, cleaners and porters - will down tools on the new March date.
Unison accused the Government of a "pick-and-mix solution" after it emerged Health Secretary Steve Barclay would be holding talks with the Royal College of Nursing on pay.