The government of the Diocese of Manchester, like all other dioceses in the Church of England, is overseen at diocesan, deanery and parish level.
Synods, Committees and Parochial Church Councils are all responsible for decisions made at various levels in the diocese. You can find membership lists here. The Governance section provides information about the constitution and regulation of these bodies, how they are elected and when they meet.
The Governance Manual provides information about the various governance structures and procedures.