Royal Mail workers will have a four-day strike in the coming weeks due to a pay dispute.
The Communications Workers Union (CWU) says more than 115,000 employees will hold their biggest summer strike ever to demand “a decent, decent pay raise”.
The walks will take place on Friday 26 and Wednesday 31 August, Thursday 8 and Friday 9 September.
It follows a recent vote for strike action featuring members vote 97.6% with 77% of voters going to the polls to take action.
The union said management responded by adopting a 2% pay increase, which it believes will result in workers’ living standards “dramatically falling” due to soaring inflation.
CWU general secretary Dave Ward said: “No one takes the decision to strike lightly, but postal workers are being pushed to the brink.
“There is no doubt that the postal workers are completely united in their determination to ensure the decent, fair wages they deserve.
“We cannot continue to live in a country where bosses make billions of dollars in profits while their employees are forced to use food banks.
“As Royal Mail bosses are raking in £758m in profits and shareholders pocket £400m, our members will not accept pleas for poverty from the company.
“Postal workers will not accept their standard of living being influenced by greedy business leaders who are completely out of touch with modern Britain.
“They’re sick of the company’s failure being rewarded over and over again.
“CWU’s message to Royal Mail’s leadership is simple – there will be severe disruption until you actually get paid.”
Royal Mail has apologized to its customers for the disruption the strike will cause.
Ricky McAulay, operations director at Royal Mail said: “After more than three months of negotiations, CWU has been unable to engage in any meaningful discussion of the changes we need to modernize or bring in alternative ideas.
“CWU declined our offer of up to 5.5% for CWU-level peers, the biggest increase we’ve given in years.
“In a business that is currently losing £1 a day, we can only fund this offer by agreeing changes that will pay for it.
“Royal Mail may have a bright future, but we cannot achieve it by living in the past.”