The Communication Workers Union deputy general secretary Dave Ward said post workers were striking today due to the "reckless attitude of the post office".
If the Post Office thinks this dispute will simply fade away they are sadly mistaken. Our members are fiercely opposed to the company's plans to close and franchise offices, slash jobs and impose a pay freeze.
The company's plans are to downgrade the network, reduce services to local communities and hit jobs in the network. There is no mandate for this course of action and customers across the country are appalled at the reckless attitude of the post office towards these public services.
Mr Ward added that the strike, which will affect up to 4,000 staff in 372 offices today, could carry on into the Christmas period.
The strike and the continuing sales ban activity will continue into the Christmas period unless management see sense and negotiate a fair deal for Crown office staff.
More top news
The mother of "bucket list" cancer patient Stephen Sutton has said signs of her son's illness were "ignored".
Boxing champion and occasional actor Mike Tyson has been praised for coming to the aid of a motorcyclist injured in a crash in Las Vegas.
A website is threatening the release of hacked nude pictures of Emma Watson, reportedly in response to her speech on gender equality.