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UK Police Rank Structure
 

 Police Constable

 

 Sergeant

 

 Inspector

 

 Chief Inspector

 

 Superintendent

 

 Chief Superintendent

 

 Assistant Chief Constable

 

 Deputy Chief Constable

 

 Chief Constable

Every police officer in the United Kingdom is issued with a warrant number at their date of joining. This warrant number remains with them throughout their career and is visible on their shoulder epaulette up to and including the rank of sergeant.

Warrant numbers are not national, therefore there will be more than one "PC 123" in the United Kingdom

Larger forces such as the Metropolitan Police also assign a divisional warrant number to officers, these divisional warrant numbers have a divisional prefix consisting of one or two letters. This is due to the large number of officers in that force, With over 25,000 officers it would get silly displaying 12,578 on your shoulder!

Metropolitan Police Ranks