Royal Mail workers are to hold a 24-hour strike on Friday, 29 June , the main postal union has confirmed.
The Communications Workers Union (CWU) blamed the walkout on Royal Mail bosses not taking negotiations seriously, and said further strikes could follow.
The Royal Mail has yet to comment on the strike announcement.
It has insisted all along that it cannot afford to raise its existing 2.5% pay offer. The nationwide walkout will be the first since 1996.
'Refusing to negotiate'
"We've tried our hardest to reach a negotiated settlement with the company, but the truth is again that Royal Mail are refusing to negotiate whatsoever on reaching a settlement before strike action takes place," said CWU deputy general secretary Dave Ward.
"We have also agreed further strike action within two weeks from 29 June that is designed to maximise the impact on Royal Mail but at minimum cost to the CWU members."
Mr Ward added that the strike would include Post Office workers as well as Royal Mail delivery staff.
In addition to the pay issue, the CWU is also unhappy at the Royal Mail's restructuring plans, which it claims will cause up to 40,000 job losses.
Bosses at the Royal Mail counter that the organisation needs to make itself more efficient to be better able to compete against its rivals.
CWU members at the Royal Mail voted for the strike action with a majority of 77% on a turnout of 60%. http://news.bbc.co.uk/1/hi/business/6227916.stm