Health and public sector workers have lost confidence in the government and their patience is "running out", the leader of one of the country's biggest unions is to warn the prime minister.
Unison's general secretary, Dave Prentis (pictured), is to tell his union's health conference in Harrogate that time is running out for Labour, which is losing the trust of public sector workers "in their droves".
"The country is in a mess and we look to the government to come up with serious solutions, not to waste time in childish venom," Mr Prentis is due to say.
"But at the moment, the government is losing us. It is losing the support and trust of health and public service workers in their droves.
Some 1,000 delegates at the conference will be told that "fundamental flaws" in private finance initiative school and hospital building projects had "come home to roost" and have had to be bailed out.
"Big business will only take the profit, but won't shoulder the risk, while ordinary workers, expecting to put in a fair day's work for a fair day's pay, are rewarded with threats of job cuts, low or no pay and privatisation," Mr Prentis will add.