This study examines whether audit firm tenure has any impact on audit quality. From a sample of FTSE100 index firms over the period of 2015-2019, we investigate the relationship between short and long audit firm tenure and audit quality using the raw value of discretionary accruals. We find no significant association between audit firm tenure and audit quality during the period under review, and audit quality is not negatively impacted when audit firm tenure exceeds 5 or 10 years. Furthermore, our additional analysis of audit quality using raw value of current accruals suggests that quality is not compromised, even where there is an extended tenure of 20 or more years. This implies that UK regulators should perhaps consider abandoning the present mandatory rules regarding the rotation of auditors.