A NATIONAL strike by postal workers could be announced tomorrow when the result of a ballot for industrial action is revealed.

Members of the Communication Workers Union (CWU) who work for Royal Mail have been voting on whether to launch a campaign of action over terms and conditions.

Royal Mail is not sticking to an agreement reached last year covering a wide range of issues, including plans to reduce the working week, the CWU said.

Industrial relations at the company have worsened this year with widespread unofficial strikes breaking out virtually every week.

CWU deputy general secretary Terry Pullinger said the union and its members were facing the “fight of our lives.”

“We face an assault on our terms, conditions and national agreements like we have never seen before,” he said.

“I am confident our members will stand with the union and deliver a massive yes vote in what is the most important dispute the union has ever had.”

The Royal Mail's managing director Shane O’Riordain said the company remains open for talks.