The main role of a company secretary is to assist the director in a limited company. A company secretary is responsible for ensuring that a company complies with legal and regulatory requirements. Their main duties include maintaining the company's statutory registers, preparing and filing important legal documents, organising board meetings and general meetings, and ensuring that proper corporate governance practices are followed. 

It is no longer a legal requirement to appoint a company secretary to a private limited company, as a director can assume these responsibilities.

Please Note: this is different in a Public Liability Company (PLC), where it is a legal requirement to have an appropriately qualified Company Secretary appointed.