The boundaries of basic command units (BCUs) are determined by the responsible chief constable. Of some 225 BCUs we understand that all but six are either coterminous with a single district council or London borough, or are coterminous with a number of district councils when taken together, or when combined with a number of other BCUs are coterminous with a single council.
The boundaries of basic command Units (BCU) are determined by the responsible chief constable. I have placed in the Library a table detailing which local authorities constitute the whole or part of each BCU in England and Wales as at April 2006.