The chief officer of police of any police force may, on the application of the chief officer of police of any other police force, provide constables or other assistance for the purpose of enabling the other force to meet any special demand on its resources.

If it appears to the Secretary of State to be expedient in the interests of public safety or order that any police force should be reinforced or should receive other assistance for the purpose of enabling it to meet any special demand on its resources, and that satisfactory arrangements under subsection (1) cannot be made, or cannot be made in time, he may direct the chief officer of police of any police force to provide such constables or other assistance for that purpose as may be specified in the direction.

While a constable is provided under this section for the assistance of another police force he shall, notwithstanding section 10(1), be under the direction and control of the chief officer of police of that other force.

The police authority maintaining a police force for which assistance is provided under this section shall pay to the police authority maintaining the force from which that assistance is provided such contribution as may be agreed upon between those authorities or, in the absence of any such agreement, as may be provided by any agreement subsisting at the time between all police authorities generally, or, in the absence of such general agreement, as may be determined by the Secretary of State.