Auditors are supposed to keep businesses honest, but how much regulation is the optimum for the auditors – and how onerous and punitive should the enforcement regime be? A new consultation by the U.K. regulator, the Financial Reporting Council (FRC), opened on Oct. 1 and has put the vexed question of audit regulation back in the spotlight.

Ruth Prickett graduated from Cambridge University with a BA hons in History and has specialized in business and finance journalism for the past 20 years. She was editor of Financial Management, the magazine...