Royal Mail in Peterborough wildcat strike talks
Talks are taking place in an attempt to resolve a wildcat strike at a Cambridgeshire sorting office that has entered its fourth day.
About 170 staff walked out of the Werrington office in Peterborough on Friday morning, according to the Communication Workers Union (CWU).
The unballoted strike was triggered by disciplinary action against one member of staff.
Royal Mail said it was fully committed to trying to resolve workers' concerns.
The sorting office covers deliveries in the PE1 and PE3 to PE6 postcode areas.
Andy Beeby, branch secretary for CWU, said delivery and sorting staff were involved in the strike.
In a statement, the company apologised to customers, adding: "We are doing all we can to minimise this disruption."
"Royal Mail is fully committed to the process of trying to resolve concerns of postal workers based in Peterborough by continuing to follow the national jointly agreed framework with the CWU," it added.