Ernst & Young offices in London, photographed on 14 February 2018.
© Tolga Akmen/FT

Mark Weinberger’s statement that experts from other disciplines are essential to a quality audit (“ EY rejects call to break up Big Four”, September 14) stretches credibility. Having served EY for 30 years, I was part of the team that sold our advisory business to Capgemini in 2000. Is Mr Weinberger suggesting that EY (and the other two of the Big Four that sold their businesses shortly after) performed sub-standard audits in the years after the sale through lack of access to appropriate expertise? I doubt it.

The audit profession uses external experts where necessary and other experts such as notaries are embedded in the audit practice. Thus the IT experts needed to audit the tech companies cited by Mr Weinberger should also be embedded in the audit practice. Bear in mind also that auditing/checking businesses requires different skill sets to advising/building businesses, making his strategy even more questionable than using them on a part-time basis. Unless, of course, part of EY’s strategy is to learn state-of- the-art technology during the audit to then sell in its consulting practice to lesser developed enterprises.

John Stewart
Airport Handling, Milan, Italy

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