Can you explain how an audit committee could improve the effectiveness of the external auditors work?

An audit committee reviews financial information and liases between the auditors  and the company. The audit committee:

1. Can strengthen the position of the external auditor, by providing a channel of communication and forum for issues of concern.

2. the committee can provide a framework within which the external auditor can assert his independence in the event of a dispute with management.

3.Monitor and review the external auditor's independence, objectively and effectiveness, taking into consideration relevant UK professional and regularly requirements.