Dominic Cummings was the adviser who refused to play by the rules of conventional politics and became no stranger to the spotlight.
At the start of 2020, he wrote on his blog of wanting to become "much less important - and within a year largely redundant", with reports suggesting his departure from Downing Street will be sealed by Christmas.
His rise to political prominence came as part of Michael Gove's team, but it was his role as campaign director at the official Brexit group Vote Leave which boosted his public profile.
This may have been helped by the portrayal by Benedict Cumberbatch in a Channel 4 drama about the campaign, which played up his role in covering a red bus with the hotly-disputed £350 million-a-week for the NHS claim.
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