Sir Michael Fallon MP, UK Secretary of State for Defence

MP, UK Secretary of State for Defence 24 November 2016

Robert Hannigan, Director, GCHQ

Director, GCHQ 1 November 2016

Rt. Hon Hilary Benn MP

MP 21 July 2016

Mr Steve Hilton, CEO CrowdPac

CEO CrowdPac 22 June 2016

Sir Peter Westmacott, Former UK Ambassador to the US

Former UK Ambassador to the US 8 June 2016