Almost immediately after the break up of talks with the CWU, Royal Mail sent out letters to thousands of postal workers telling them that their start times are to be changed.
The letters said that workers in delivery offices will have their start times moved later from 8 October, while those in mail centres and the network are to be moved from 22 October.
This unnegotiated change is a major attack on workers and the union. Many postal workers fit their family and other commitments around their existing shifts, and they are paid shift allowances that reflect the unsociable hours that they work.
Now Royal Mail is to tear all that up.
The CWU is responding to the threats by relaunching the Do Your Job Properly campaign, in which workers are urged not to start early, to take all the breaks they are entitled to, and not to use their cars to speed up deliveries.
This strategy has proved a massive success in the areas where it has been implemented, causing mail to pile up and managers to be shipped in from other offices to deal with the backlog.
Royal Mail is nevertheless determined to implement the change.
The best way to respond to any attempt to introduce unnegotiated changes to hours is an immediate walkout.