Sir Thomas Whinfield Scholar is a British civil servant who served as Permanent Secretary to the Treasury from 2016 to 2022. He was previously the prime minister's adviser on European and global issues in the Cabinet Office from 2013 to 2016. He has been a director of the nationalised bank Northern Rock, and served as chief of staff for Gordon Brown.

James Edward Bowler CB is a senior British civil servant currently serving as the Permanent Secretary to the Treasury since October 2022 having previously served as permanent secretary at the Department for International Trade since 2021. Before assuming this role, Bowler was the second permanent secretary at the Cabinet Office from 2020 to 2021 where he led the COVID Taskforce for the British Government. He was the Director General for Policy, Communication and Analysis at the Ministry of Justice from March to October 2020. Bowler is currently Trustee of the charity Police Now.