Thousands of items of mail were left undelivered, which Royal Mail said was due to staff sickness, but the CWU said delivery rounds were too large for workers.
BBC: Bristol postal worker strikes 'inevitable'
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Thousands of items of mail were left undelivered, which Royal Mail said was due to staff sickness, but the CWU said was because delivery rounds were too large for workers.
BBC: Bristol union announces first Christmas postal strike
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It comes as thousands of items of mail have been left undelivered at a Royal Mail sorting office since last Friday.
BBC: Postal workers in Bristol call for strike action