As a young civil servant, Jeremy Heywood's insightful questioning of the status quo pushed him to the centre of political power in this country for more than 25 years.

He directly served four Prime Ministers in various roles including as the first and only Permanent Secretary of 10 Downing Street, the Cabinet Secretary and the Head of the Home Civil Service. He was at the centre of every crisis from the early 1990s until 2018 and most of the key meetings. Invariably, when faced with a new policy initiative a Prime Minister's first response would be: 'but what does Jeremy think?'