In addition, he was the Deputy National Security Adviser for the Integrated Review on diplomacy, development and defence.

[4] He also served as Director General of the Department for Exiting the EU.

[6] Ellis taught history at St Edward's School, Oxford, before joining the Foreign and Commonwealth Office (FCO) in 1990.

[4] In November 2016 it was announced that Ellis would become Director General at the Department for Exiting the European Union.

[8] Subsequently, he was promoted to Knight Commander of the Order (KCMG) in the King's Birthday Honours for 2024.