A spokesman for Deloitte declined to give an immediate comment.
"It is an unsolicited document that has nothing to do with the government at all. It was not commissioned by the government, it was produced by an individual from an external accountancy firm, who was not working for government," the spokesperson told reporters, saying the memo had "no credence".
Theresa May making 'huge mistake' with hard Brexit: former deputy PM
She said the government did not recognise the concerns the memo raised and said it was for "Deloitte to answer what it is about". She added: "It does seem as though this is a firm touting for business now aided by the media."
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