The CWU plans a national ballot in September
Workers at Royal Mail are set for more strikes in the week starting 17 August, in a dispute over job cuts.
Postal workers, including in London, the Midlands, Yorkshire, Bristol and Northern Ireland are set to participate in the action on various days.
The move by the Communication Workers Union (CWU) follows strikes across the UK earlier this month.
The next phase of strikes comes as the CWU aims to issue a national ballot in September regarding industrial action.
The union says that managers have broken an agreement over pay and services - Royal Mail has responded by arguing that the union reneged on a deal.
The strikes starting on Monday will affect collections, deliveries and sorting offices differently depending on the area, throughout the week.