Cheshire Constabulary is the territorial police force responsible for policing the ceremonial county of Cheshire in North West England, comprising the unitary authorities of Cheshire East, Cheshire West and Chester, Borough of Halton and Borough of Warrington. The force is responsible for policing an area of 946 square miles (2,450 km2) with a population of approximately 1 million people.

Merseyside Police is the territorial police force responsible for policing Merseyside in North West England. The service area is 647 square kilometres with a population of around 1.5 million. As of September 2017 the service has 3,484 police officers, 1,619 police staff, 253 police community support officers, 155 designated officers and 208 special constables. The force is led by Chief Constable Serena Kennedy.