Police officers in Scotland will today take the "most overt demonstration of action" in more than 100 years by withdrawing their "goodwill" amid an ongoing dispute over pay.
Calum Steele, general secretary of the Scottish Police Federation, which represents officers, said the action will start at 5pm on Friday, July 1.
While officers in Scotland are prohibited by law from taking industrial action, withdrawing goodwill will show "significant discontent" Steele said.
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The action means officers will not start their shifts early or take radio equipment home when their duty ends.
The union's governing body, the Joint Central Committee (JCC), had previously rejected a "derisory" offer of a £564 pay increase.
In a letter to Chief Constable Iain Livingstone, Steele said the action being taken was a "manifestation of the strength of feeling of our members of the utter contempt this pay offer represents to them".
He told Livingstone: "It will not be lost on you that this is the most significant discontent in the police service since the 1970s, and the most overt demonstration of action by our members in over 100 years."
Steele also spoke about the action to the BBC's Good Morning Scotland programme on Friday.
He said further conversations about the pay offer had taken place on Thursday "almost the moment First Minister's Questions came to an end", where the issue was raised in the Scottish Parliament.
However, he said the federation had not received a formal offer of improved pay and more talks would take place on Monday.
He said: "I think it's important that the demonstration as to the frustration that our members feel continues until such time as this pay dispute is resolved."
Asked if the public could still rely on the police service as they normally would, he said: "There's no reason whatsoever why there should be any alteration to the police service that the public receive, either as victims of crime or just through general day-to-day presence."
A Police Scotland spokesperson stressed that the force remained committed to seeking a settlement.
They said: "We recognise the considerable goodwill officers bring to their roles on a daily basis as they keep people safe across the country, and this is also valued by the communities they serve."
First Minister Nicola Sturgeon has urged those involved to "work together constructively" in order that a "fair and affordable pay increase can be agreed".
She added: "Our police officers do deserve it and we will continue to value policing and give it the priority it deserves."
Pressed on the issue in Holyrood on Thursday, she said that Justice Secretary Keith Brown had had "constructive" discussions with the SPF in recent days.
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