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Approximately 3,000 staff at hundreds of Crown post offices protesting against pension changes, job security and closures are expected to walk out on Monday, Tuesday and Saturday. On Wednesday and Thursday, workers who supply many sub-post offices with cash may also join the action.
Post Office communications officer Mark Davies said “The company is trying to become more efficient and reduce its losses, which would be good news for the taxpayer.”
Officials say so far 28 branches have confirmed they are closed, with "business as usual" in most places.
A Royal Mail spokesman said: "There will be little or no impact on Royal Mail as a result of the CWU strike at the Post Office, deliveries will carry on as normal and the last posting dates for Christmas remain unchanged."