4Petty sessions areas
(1)The following areas are petty sessions areas—
(a)any specified area which is not divided into petty sessional divisions;
(b)any petty sessional division of a specified area; and
(c)the City of London.
(2)For the purposes of subsection (1)(a) and (b) above “specified area” means—
(a)a retained county;
(b)a metropolitan district;
(c)the inner London area; or
(d)an outer London borough.