And Royal Mail, another large local employer, may move Crewe's postal sorting office elsewhere.
Workers at a Bristol postal sorting office have voted for a strike in a dispute over their workload.
Postal workers at a delivery office in south Bristol are planning more strikes in a workload dispute.
About 100 postal workers at a delivery office in south Bristol are staging a second one-day strike.
Postal workers at a delivery office in east Kent are striking on Saturday over the reorganisation of services.
Everyone would like, I think, to see a robust postal service -- the Post Office represents the nation at home.
The Royal Mail worked with the Foreign and Commonwealth Office and the Universal Postal Union in Switzerland to provide the postcode.
His union is opposed to the current version of the House bill, which gives the Postal Service wide leeway to close post office branches and make employee cuts to balance its budget.
The device was discovered by postal workers at the town's sorting office shortly before 09:00 GMT on Friday.
When the government decided to replace the Post Office Department with the U.S. Postal Service in 1971, it exchanged a taxpayer-dependent bureaucracy with a government-owned business that was supposed to rely on the sale of postage, mail products, and services for revenue.
It is believed to have been posted in Ayrshire before being found in a letter box by a postal worker on Friday and taken to a Royal Mail sorting office in Kilwinning, where police were contacted.
Chiefs at Postwatch Wales, the consumer watchdog for postal services, have already expressed their worry about the future of the Post Office.
BBC: Villagers might not have to travel out of the community
Prior to the Postal Act of 1863, intercity letters were either held at the destination post office for pick-up or delivered by an independent contractor.
Ruth Goldway, chairman of the Postal Regulatory Commission that oversees postal operations, said the provision in the spending bill would make it hard for the Post Office to implement the Saturday cuts.
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