125.Section 27 places a duty on a relevant authority to ensure that its members and co-opted members maintain high standards of conduct and requires such authorities to adopt a code of conduct for their members. “Relevant authority is defined by subsection (6). Section 27 provides for a parish council to adopt the code adopted by its principal authority if it wishes. In the case of the Greater London Authority, it provides that the standards functions are to be discharged jointly by the Mayor and Assembly. It also defines what a ‘co-opted member’ is and what a relevant authority is for the purpose of this Chapter.