The UK is the only major country within the European Union the majority of whose listed companies have formed audit committees composed of non-executive directors to monitor financial reporting, the external auditors, and internal control strength. The adoption of audit committees in contrast to the approach in Europe has arisen despite the lack of evidence on their effectiveness even in the USA and Canada, where they have been mandatory since the 1970s. This paper seeks to establish whether audit committees are effective in ensuring audit quality by protecting the auditors from fee cuts which might affect audit quality, and signal tighter internal controls which help to reduce audit time and hence audit fees. The problem is that the audit committee may be expected to exert a two-way pressure on audit fees. To the extent that audit committees should enhance audit quality, partly by ensuring that audit hours are not reduced, an audit committee may be expected to increase total audit fees. At the same time,...