However, senior officials said his conduct will be criticised as "deeply unsatisfactory". A ￡58,000 donation was given from Lord David Brownlow to refurbish Downing Street's No 11 flat.

       Lord Christopher Geidt, the independent standards adviser who initially cleared Mr Johnson, is said to have been rethinking his stance after an Electoral Commission probe exposed WhatsApp messages between the PM and Lord Brownlow.

       The Cabinet Office and Downing Street declined to comment.

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