"boroughs" corresponds to "(gradske) općine šireg područja Londona"
https://en.wikipedia.org/wiki/List_of_London_boroughs which - to make things slightly strange - DO NOT include the only part called "London" i.e. the "City of London" that has its own separate police.
The City of London Police is the territorial police force responsible for law enforcement within the City of London, including the Middle and Inner Temples. The force responsible for law enforcement within the remainder of Greater London, outside the City, is the Metropolitan Police Service, a separate organisation.
https://en.wikipedia.org/wiki/City_of_London_Police