Guest Stars Hayley Atwell as Freya Deverell Samuel West as Peter Scabius (Older) Ed Stoppard as Ben Leeping (Older) Conor Nealon as Logan Mountstuart (Child) Gillian Anderson as Wallis Simpson Emerald Fennell as Lottie Tom Hollander as Prince of Wales Julian Ovenden as Ernest Hemingway Flaminia Cinque as Mrs. Mountstuart Holliday Grainger as Tess Scabius