Britain's big four accountancy firms are facing their own audit after a watchdog recommended a full-blown competition inquiry into the industry.
Deloitte, KPMG, Ernst & Young and PricewaterhouseCoopers, who are responsible for checking the books of nearly all of the UK's largest companies, were criticised last year by a House of Lords committee.
In a statement, the Office of Fair Trading (OFT) said it was concerned that this market was "highly concentrated".
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