Tim Pigott-Smith as Charles

Charlotte Riley as Kate Middleton

Oliver Chris as William

Adam James as Prime Minister Tristram Evans

Richard Goulding as Harry

Max Bennett as Coottsey

Tamara Lawrance as Jess

Margot Leicester as Camilla

Tim McMullan as James Reiss

Priyanga Burford as Mrs Stevens

Katie Brayben as Diana

John Shrapnel as Archbishop of Canterbury

Parth Thakerar as Spencer

Grant Crookes as Mourner

Philip Gascoyne as Admiral (uncredited)