If the person who is returned at an election as the elected mayor of a local authority is also returned at an election held at the same time as a councillor of the authority, a vacancy shall arise in the office of councillor.
If the person who is returned at an election ("the mayoral election") as the elected mayor of a local authority—
a vacancy shall arise in the office of councillor.
Subject to subsection (4), a person who is the elected mayor of a local authority may not be a candidate in an election for the return of a councillor or councillors of the authority.
A person who is the elected mayor of a local authority may be a candidate in an election for the return of a councillor or councillors of the authority if the election is held at the same time as an election for the return of the elected mayor of the authority, but subsection (1) applies if he is a candidate in both such elections and he is returned both as the elected mayor and as a councillor.