Hundreds of Crown Post Office managers will go on strike today in a row over pay.
Unite warned that the action will hit services at the larger branches, usually sited on high streets.
The union, which represents 900 managers, said its members have not received a pay rise since June 2011 and accused the Post Office of "dragging its feet."
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The Labour leadership contender promised to focus on 'equality of outcome' rather than the 'equality of opportunity' pursued under Blair.
A dull and wet start with some sunshine in south-east Scotland and north-east England.