Guest Stars Romesh Ranganathan as Himself James Acaster as Himself Tiff Stevenson as Herself Nathan Stewart-Jarrett as Maurice Wilkins Ralph Ineson as King Henry II Alice Lowe as Rosalind Franklin Marek Larwood as Knight Steve Oram as Thomas Becket Richard Rycroft as Boss 2 Lisa McAllister as Boss 1 Adam Riches as James Watson Joseph Morpurgo as Francis Crick Joseph Varley as Knight