Postal workers across Waltham Forest are set to strike in protest at jobs cuts.
Royal Mail employees across London were balloted and voted in favour of 24-hour action on June 19.
The union accuses bosses of breaking promises over modernisation of the service.
Dave Ward, Communication Workers Union general secretary, said: "Royal Mail is blocking modernisation by refusing to negotiate change.
"There is growing unrest across the country as Royal Mail tries to impose damaging cuts and changes withour the input of union reps.
“The future of the business must be safeguared through careful planning, not shooting from the hip."
In response to the announcement, a Royal Mail spokewoman said: "The CWU's threat to customers of damaging strike action in London is completely at odds with its repeated claim to support modernisation and to introduce new ways of working throughout the business."
The company suggests productivity in London is up to 35 per cent behind the UK's best-performing areas and around 10 per cent behind the national average.
"A strike will not modernise Royal Mail - it will simpy disrupt the service to which customers are entitled, lead to an even greater loss of business and leave Royal Mail far less able to protect full time jobs," the spokesperson added.
The strike will start from the early shift and will cover all areas of deliveries, collections and processing. The union has promised further action if the situation continues.
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