How Sir Mark Sedwill became Theresa May's supreme 'securocrat' – and pivotal in the Gavin Williamson affair

In his one and only interview as Cabinet Secretary, Sir Mark Sedwill spoke of the importance of keeping ‘a sense of perspective’ and ‘shouldering responsibility’ when it came to taking decisions on ‘the big issues’. Speaking to Civil Service Quarterly, a government publication, the 54-year-old ‘securocrat’ described how he drew on his former career in security and international relations to become the country’s most senior civil servant - and some say, the most powerful man in the country.