On the plus side, smaller firms permit more customized communications between advisers and clients, as well as greater flexibility regarding third party investment products.

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The order stems from a decision by the Bush administration earlier this year to block the release of almost 70, 000 pages of confidential communications between President Ronald Reagan and his top advisers, that the Reagan library wanted to make public.

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The book apparently features quotes from both Anita Dunn, a former communications director and Christina Romer, former Chair of the Council of Economic Advisers.

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Mr Gove and Mr Wormald had been recalled to answer questions about a senior civil servant's allegations of bullying by one of the secretary of state's special advisers, Dominic Cummings, and James Frayne, his department's former head of communications.

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